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Voltage-gated channels. inactivation gate, deactivation and activation ion channel. Open and close gate. Interior of the cell is negatively charged and the exterior is positively charged and vice versa 矢量图像

#63923734 - Voltage-gated channels. inactivation gate, deactivation and activation..

Facilitated diffusion or facilitated transport or passive-mediated transport. Carrier protein

#63923732 - Facilitated diffusion or facilitated transport or passive-mediated..

sodium-potassium pump or sodium-potassium adenosine triphosphatase. After binding ATP, the pump binds 3 ions sodium. ATP is hydrolyzed. the ions go to the outside. then The pump binds 2 extracellular ions potassium and transporting the ions into the cell. 矢量图像

#63923729 - sodium-potassium pump or sodium-potassium adenosine triphosphatase...

Schematic depiction of water molecule movement through of the aquaporin channel. 矢量图像

#63923720 - Schematic depiction of water molecule movement through of the..

stem cell application. Using stem cells to treat disease 矢量图像

#63923714 - stem cell application. Using stem cells to treat disease

Lever. simple machines. Archimedes. lever is a machine consisting of a beam or rigid rod pivoted at a fixed hinge or fulcrum. Lever, one of the six simple machines identified by Renaissance scientists. 矢量图像

#63923673 - Lever. simple machines. Archimedes. lever is a machine consisting..

Isotopes of hydrogen: protium, deuterium and tritium. Diagram Comparing Hydrogen Atoms 矢量图像

#63923666 - Isotopes of hydrogen: protium, deuterium and tritium. Diagram..

Electromagnetic Spectrum. The spectrum of waves includes infrared rays, visible light, ultraviolet rays, and X-rays. Human eyes are only sensitive to the range that is between wavelength 780 nanometers and 380 nanometers in length. 矢量图像

#63923662 - Electromagnetic Spectrum. The spectrum of waves includes infrared..

The three fundamental states of matter. The molecules of solid, gas and liquid in glass

#63923658 - The three fundamental states of matter. The molecules of solid,..

Types of ion channel. Classification by gating. mechanism of action. Voltage-Gated, Ligand-gated, Mechanically-gated and Always open ion channels

#63923652 - Types of ion channel. Classification by gating. mechanism of..

Amanita muscaria. Mushroom Anatomy 矢量图像

#63923647 - Amanita muscaria. Mushroom Anatomy

Electromagnetic spectrum. different types of electromagnetic radiation by their wavelengths. In order of increasing frequency and decreasing wavelength 矢量图像

#63923646 - Electromagnetic spectrum. different types of electromagnetic..

states of matter. phase or state of matter and phase transition. This diagram shows the different phase transitions for example water

#63923636 - states of matter. phase or state of matter and phase transition...

A tsunami is a series of huge waves. It washes against the coast several times with great speed and force. Tsunamis generated by submarine earthquakes travel at subsonic speed across the ocean surface.

#63923635 - A tsunami is a series of huge waves. It washes against the coast..

Plate movement. A cross section illustrating the main types of tectonic plate boundaries. convergent, divergent, and transform

#63923634 - Plate movement. A cross section illustrating the main types of..

Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids. 矢量图像

#63923633 - Acid rain is caused by emissions of sulfur dioxide and nitrogen..

Continental drift on the planet Earth. Before (Pangaea - 200 million years ago) and after (modern continents)

#63923609 - Continental drift on the planet Earth. Before (Pangaea - 200..

Tides depend where the sun and moon are relative to the Earth. Gravity and inertia creating tidal bulges on opposite sides of the planet. The gravitational force of the moon pulls the ocean�s waters toward it, creating bulge. On the far side of the Earth, 矢量图像

#63923561 - Tides depend where the sun and moon are relative to the Earth...

Layers of the Atmosphere: Exosphere; Thermosphere; Mesosphere; Stratosphere and Troposphere. Vertical Structure of the Earth's atmosphere. Layers drawn to scale, objects within the layers are not to scale

#63923544 - Layers of the Atmosphere: Exosphere; Thermosphere; Mesosphere;..

leaf anatomy. diagram of leaf structure 矢量图像

#63903573 - leaf anatomy. diagram of leaf structure

Plant cell anatomy. Cross section of a plant cel 矢量图像

#63903571 - Plant cell anatomy. Cross section of a plant cel

Ion channel. structure of the channel. Vector diagram.

#63903570 - Ion channel. structure of the channel. Vector diagram.

Atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. Exosphere; Thermosphere; Mesosphere; Stratosphere, Troposphere.

#63863512 - Atmosphere of Earth is a layer of gases surrounding the planet..

Nitrogen cycle. process by which nitrogen is converted between its various chemical forms. The processes of the nitrogen cycle: nitrogen fixation, ammonification, nitrification, and denitrification.

#63146746 - Nitrogen cycle. process by which nitrogen is converted between..

carbon cycle. The carbon path from the atmosphere, into living organisms, then turning into dead organic matter, and back into the atmosphere.

#63133912 - carbon cycle. The carbon path from the atmosphere, into living..

#62837429 - Soil Profile and Soil horizons. Piece of land with green grass..

Oil extraction. Conventional drilling. Earth layers.

#62818977 - Oil extraction. Conventional drilling. Earth layers.

soil layers and aquifer. 矢量图像

#62671522 - soil layers and aquifer.

Taste receptors of the tongue. Are present in the taste buds of papillae. Taste buds are sensitive to the five major groups of tastes (sweet, salty, sour, bitter, and umami)

#60675779 - Taste receptors of the tongue. Are present in the taste buds..

Human tongue, Lingual papilla and taste bud. Taste receptors of the tongue are present in papillae, and are the receptors of taste 矢量图像

#60662028 - Human tongue, Lingual papilla and taste bud. Taste receptors..

Evolution of the Universe. Cosmic Timeline and evolution of stars, galaxy and Universe after Big Bang

#60313412 - Evolution of the Universe. Cosmic Timeline and evolution of stars,..

Earth's seasons. Illumination of the earth during various seasons. The Earth's movement around the Sun. Top position: vernal equinox. Bottom: autumnal equinox. Left: summer solstice. Right: winter solstice.

#60313410 - Earths seasons. Illumination of the earth during various seasons...

Groundwater and Artesian aquifer. Water table

#60245265 - Groundwater and Artesian aquifer. Water table

Stomach disease: belching, Heartburn or reflux. The illustration stomach, esophagus and sphincter. Human anatomy

#59288388 - Stomach disease: belching, Heartburn or reflux. The illustration..

Cervical Cancer. Carcinoma of Cervix. Malignant neoplasm arising from cells in the cervix uteri. Vaginal bleeding. Vector diagram

#59245928 - Cervical Cancer. Carcinoma of Cervix. Malignant neoplasm arising..

Photoreceptor cells in the retina of the eye. retinal cells. rod cell and cone cell. The arrangement of retinal cells is shown in a cross section 矢量图像

#59202821 - Photoreceptor cells in the retina of the eye. retinal cells...

Photoreceptor cells in the retina of the eye. retinal cells. rod cell and cone cell. The arrangement of retinal cells is shown in a cross section 矢量图像

#59184884 - Photoreceptor cells in the retina of the eye. retinal cells...

Periodontitis is a inflammatory diseases affecting the periodontium, the tissues that surround and support the teeth 矢量图像

#59113774 - Periodontitis is a inflammatory diseases affecting the periodontium,..

Primary lung cancers metastasize to the liver. Metastasis or Metastases

#59002719 - Primary lung cancers metastasize to the liver. Metastasis or..

Endocrine gland and hormones. Human endocrine system. anatomy. Human silhouette with highlighted red color internal organs.

#59001654 - Endocrine gland and hormones. Human endocrine system. anatomy...

Human anatomy. Endocrine system (pituitary gland, pineal gland, testicle, ovary, pancreas, thyroid, thymus, adrenal gland). Set icons. Vector

#59000606 - Human anatomy. Endocrine system (pituitary gland, pineal gland,..

pituitary hormone functions. The two lobes, anterior and posterior, function as independent glands.

#57464272 - pituitary hormone functions. The two lobes, anterior and posterior,..

A telomere is a repeating sequence of double-stranded DNA located at the ends of chromosomes. Each time a cell divides, the telomeres become shorter. Eventually, the telomeres become so short that the cell can no longer divide.

#57464269 - A telomere is a repeating sequence of double-stranded DNA located..

Cell division Mitosis scheme 矢量图像

#57464268 - Cell division Mitosis scheme

Common bacteria infecting human. illustration
Bacteria are classified into 5 groups according to their basic shapes: spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes). 矢量图像

#57464261 - Common bacteria infecting human. illustration Bacteria are classified..

olfactory system inside the human head. the olfactory bulb at the top which connects to scent cells at the bottom to identify odors

#56921157 - olfactory system inside the human head. the olfactory bulb at..

Nasal mucosa cells. Nasal secretions. Ciliated, basal and goblet cells. Olfactory epithelium. Cells act as a low resistance filter 矢量图像

#56921156 - Nasal mucosa cells. Nasal secretions. Ciliated, basal and goblet..

Anatomy of a typical human neuron (axon, synapse, dendrite, mitochondrion, myelin sheath, node Ranvier and Schwann cell). Vector diagram

#56921155 - Anatomy of a typical human neuron (axon, synapse, dendrite, mitochondrion,..

Structure of a typical chemical synapse. neurotransmitter release mechanisms. Neurotransmitters are packaged into synaptic vesicles transmit signals from a neuron to a target cell across a synapse.

#56921154 - Structure of a typical chemical synapse. neurotransmitter release..

Normal Joint and Rheumatoid Arthritis. Rheumatoid Arthritis (RA)�is an inflammatory type of arthritis that usually affects joint. auto immune disease. The body's immune system mistakenly attacks healthy tissue.

#56921152 - Normal Joint and Rheumatoid Arthritis. Rheumatoid Arthritis (RA)�is..

$Osteoporosis - is a disease of bones that leads to an increased risk of fracture. Vector$

#56921151 - Osteoporosis - is a disease of bones that leads to an increased..

structure of motor neuron. Vector diagram. Include dendrites, cell body with nucleus, axon, myelin sheath, nodes of Ranvier and motor end plates. The impulses are transmitted through the motor neuron in one direction

#56921147 - structure of motor neuron. Vector diagram. Include dendrites,..

Disc degeneration it's the normal wear and tear process of aging spine. intervertebral discs lose their flexibility, elasticity, and shock-absorbing characteristics.

#56720064 - Disc degeneration its the normal wear and tear process of aging..

The human circulatory system

#56719890 - The human circulatory system

Each skeletal muscle fiber has many bundles of myofilaments. Each bundle is called a myofibril. This is what gives the muscle its striated appearance. The contractile units of the cells are called sarcomeres.

#56719800 - Each skeletal muscle fiber has many bundles of myofilaments...

Types of Diabetes. Type 1 and Type 2 Diabetes Mellitus. Insulin-Dependent Diabetes Mellitus and Non Insulin-Dependent Diabetes Mellitus. Insulin resistance and insufficient insulin production. 矢量图像

#56717327 - Types of Diabetes. Type 1 and Type 2 Diabetes Mellitus. Insulin-Dependent..

artery and vein. Circulatory system. Red indicates oxygenated blood, blue indicates

#56717101 - artery and vein. Circulatory system. Red indicates oxygenated..

Cell-mediated immunity. T lymphocytes do not secrete antibodies. this response incorporates activated macrophages, natural killer cells, antigen-specific cytotoxic T-lymphocytes as well as release of cytokines.

#56717100 - Cell-mediated immunity. T lymphocytes do not secrete antibodies...

humeral immunity. Lymphocyte, antibody and antigen.

#56717095 - humeral immunity. Lymphocyte, antibody and antigen.

endocrine system. Human anatomy. Man and woman silhouette with highlighted internal organs.

#56717084 - endocrine system. Human anatomy. Man and woman silhouette with..

The laser emits an invisible light which penetrates the skin without damaging it

#55495727 - The laser emits an invisible light which penetrates the skin..

Hair anatomy. The hair shaft grows from the hair follicle consisting of transformed skin tissue. The epidermal cells transform at the command of the dermal papilla cells and generate the hair shaft. 矢量图像

#55495726 - Hair anatomy. The hair shaft grows from the hair follicle consisting..

Oily & dry skin. Different. Human Skin types and conditions. A diagrammatic sectional view of the skin. 矢量图像

#55495725 - Oily & dry skin. Different. Human Skin types and conditions...

Visual representation of skin changes over a lifetime. 矢量图像

#55495724 - Visual representation of skin changes over a lifetime.

Melanoma or skin cancer. This rare type of skin cancer originates from melanocytes. layers of the human skin. 矢量图像

#55495723 - Melanoma or skin cancer. This rare type of skin cancer originates..

younger skin and aging skin. elastin and collagen. A diagram of younger skin and aging skin showing the decrease in collagen and broken elastin in older skin. 矢量图像

#55495722 - younger skin and aging skin. elastin and collagen. A diagram..

Visual representation of skin changes over a lifetime. Collagen and elastin form the structure of the dermis making it tight and plump. Fibroblasts synthesize collagen and elastin.

#55495721 - Visual representation of skin changes over a lifetime. Collagen..

Types of acne pimples. Healthy skin and Pustules

#55495719 - Types of acne pimples. Healthy skin and Pustules

Types of acne pimples. Healthy skin and Blackheads

#55495718 - Types of acne pimples. Healthy skin and Blackheads

Healthy skin and Whiteheads. Types of acne pimples 矢量图像

#55495717 - Healthy skin and Whiteheads. Types of acne pimples

Types of acne pimples. Healthy skin, Whiteheads and Blackheads, Papules and Pustules 矢量图像

#55495716 - Types of acne pimples. Healthy skin, Whiteheads and Blackheads,..

Nitrogen cycle. The processes of the nitrogen cycle transform nitrogen from one form to another. Illustration of the flow of nitrogen through the environment. 矢量图像

#54571499 - Nitrogen cycle. The processes of the nitrogen cycle transform..

solution is a homogeneous mixture. Substance dissolved in another substance. Solid in liquid

#54533460 - solution is a homogeneous mixture. Substance dissolved in another..

Physics and science icons set. Classical mechanics. Experiments equipment, tools, magnet, atom, pendulum, Newton's Laws and the simplest mechanisms of Archimedes 矢量图像

#54511820 - Physics and science icons set. Classical mechanics. Experiments..

Electrolysis process. On passing electric current the cations move towards the cathode and get deposited. Simultaneously the anions move towards the anode. galvanic cell element. Experimental set up for electrolysis

#54511819 - Electrolysis process. On passing electric current the cations..

stages of caries development. Dental disease: caries, pulpitis and periodontitis

#54511817 - stages of caries development. Dental disease: caries, pulpitis..

dental problem. Tooth disease: sensitive teeth, caries, calculus, gingivitis, periodontitis and bad breath

#54511816 - dental problem. Tooth disease: sensitive teeth, caries, calculus,..

Pulpitis. root canal therapy. Infected pulp is removed from the tooth and the space occupied by it is cleaned and filled with a gutta percha. Post inserted to support crown

#54511815 - Pulpitis. root canal therapy. Infected pulp is removed from the..

Gastroparesis or delayed gastric emptying. Visual comparison of healthy gastric and stomach with Gastroparesis. 矢量图像

#54511475 - Gastroparesis or delayed gastric emptying. Visual comparison..

Indigestion or dyspepsia. stomach disease. Sign and symptoms 矢量图像

#54511474 - Indigestion or dyspepsia. stomach disease. Sign and symptoms

lymphocyte. Structure cell. Lymphocyte - type of white blood cell

#54511472 - lymphocyte. Structure cell. Lymphocyte - type of white blood..

Newton's second law. Newton�s second law of motion is about the relationship between force, mass, and acceleration. 矢量图像

#54511467 - Newtons second law. Newton�s second law of motion is about the..

Short circuit. It occurs when the conductors leading from and back to the power source become connected

#54511466 - Short circuit. It occurs when the conductors leading from and..

Cyclones and Anticyclones. A cyclone - system of winds that rotates around a center of low pressure. An anticyclone - system of winds that rotates around a center of high pressure.

#54511465 - Cyclones and Anticyclones. A cyclone - system of winds that rotates..

Series and parallel circuits. In series are connected along a single path, so the same current flows through all of the components. Components connected in parallel are connected so the same voltage is applied to each component. 矢量图像

#54511461 - Series and parallel circuits. In series are connected along a..

Conservation of energy. Simple Pendulums. When pendulum moving towards the mean position the potential energy is converted to kinetic energy. 矢量图像

#54511460 - Conservation of energy. Simple Pendulums. When pendulum moving..

chemical reaction. New compounds (water molecule) are formed as a result of the rearrangement of atoms oxygen and hydrogen

#54511459 - chemical reaction. New compounds (water molecule) are formed..

Inertia it is the tendency of objects to keep moving in a straight line at constant velocity or tendency of an object to stay at rest 矢量图像

#54511458 - Inertia it is the tendency of objects to keep moving in a straight..

Density. Demonstrate the density of two objects by comparing the mass of equal volumes.

#54511457 - Density. Demonstrate the density of two objects by comparing..

Hookes law. law of elasticity. for relatively small deformations of an object, the displacement or size of the deformation is directly proportional to the deforming force or load. 矢量图像

#54511456 - Hookes law. law of elasticity. for relatively small deformations..

Diffusion - process in physics. Particles in a glass of water randomly move around, the particles will eventually become distributed randomly and uniformly. It is a process, which involves movement of a substance from a region of its higher concentration

#54500361 - Diffusion - process in physics. Particles in a glass of water..

simple Electric motor. A rectangular loop of wire is sitting inside a magnetic field. commutator - a circular metal ring that is split into two halves. The ends of the wire loop turn around inside the commutator. One side of the commutator is connected to

#54340033 - simple Electric motor. A rectangular loop of wire is sitting..

Thyroid Nodules and Goiters. Anatomy of the thyroid gland (included throat, thyroid gland and trachea)

#54200399 - Thyroid Nodules and Goiters. Anatomy of the thyroid gland (included..

Obesity and overweight infographic. Effects on health. Medical infographic. Set elements and symbols for your design. 矢量图像

#54198727 - Obesity and overweight infographic. Effects on health. Medical..

Medical infographic. Woman and man silhouette with highlighted internal organs 矢量图像

#54127983 - Medical infographic. Woman and man silhouette with highlighted..

Allergy. Allergies also known as allergic diseases. Medical infographic. Set elements and symbols for your design

#53876339 - Allergy. Allergies also known as allergic diseases. Medical infographic...

Stomach disease. Medical infographic. Set elements and symbols for design.

#53821358 - Stomach disease. Medical infographic. Set elements and symbols..

Cell membrane. A detailed diagram models of membrane Structure 矢量图像

#53764643 - Cell membrane. A detailed diagram models of membrane Structure

Nephrotic syndrome. kidney disorder. Signs and symptoms. clinical and laboratory findings present in Nephrotic Syndrome

#53675496 - Nephrotic syndrome. kidney disorder. Signs and symptoms. clinical..

Male and female Skin. Structure and Different. Man's epidermis is much thicker than a woman's. In women, the collagen bonds vertically. In men, where the compartment walls run diagonally in a crisscross pattern 矢量图像

#53674236 - Male and female Skin. Structure and Different. Mans epidermis..

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关于123RF

关于

特征

博客

指导课程

服务

Corporate+

123rf合作伙伴计划

123RF联盟计画

优惠代码

政策

Legal

执照

隐私声明

权力条规

123RF-Cookie政策

国际

Русский язык

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需要帮助吗？请联络您的客户经理

@ 1 866 655 3733

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Follow us on Twitter

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