Cell biology

Cell biology

The study of cell structure, physiological properties, interactions with the environment and life cycle.

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Cell biology

action potential

Biology; Cell biology

A reversal of the electrical potential in the plasma membrane of a neuron that occurs when a nerve cell is stimulated; caused by rapid changes in membrane permeability to sodium and potassium.

adaptation

Biology; Cell biology

Tendency of an organism to suit its environment; one of the major points of Charles Darwin's theory of evolution by natural selection: organisms adapt to their environment. Those organisms best ...

acid

Biology; Cell biology

A substance that increases the number of hydrogen ions in a solution.

The precipitation of sulfuric acid and other acids as rain. The acids form when sulfur dioxide and nitrogen oxides released during the combustion of fossil fuels combine with water and oxygen in the ...

acquired immunodeficiency syndrome (AIDS)

Biology; Cell biology

A collection of disorders that develop as a result of infection by the human immunodeficiency virus (HIV), which attacks helper T cells, crippling the immune system and greatly reducing the body's ...

acoelomates

Biology; Cell biology

Animals that do not have a coelom or body cavity; e.g., sponges and flatworms.

acetylcholine

Biology; Cell biology

A chemical released at neuromuscular junctions that binds to receptors on the surface of the plasma membrane of muscle cells, causing an electrical impulse to be transmitted. The impulse ultimately ...