Biology

Myelin Definition Myelin is a whitish, fatty substance that forms a sheath around many vertebrate nerve fibers. Myelin insulates the nerves and permits the rapid…

Neuroglia Definition Neuroglia is the delicate connective tissue which supports and binds together the nervous elements of the central nervous system. One part of it,…

Ependyma Definition Ependyma is the membrane lining the ventricles of the brain and the central canal of the spinal cord. It is one of the…

Ventricular System Definition Ventricular system is comprised of a series of four cavities in the brain that produce cerebrospinal fluid (CSF). It is a series…

Cerebrospinal Fluid Definition Cerebrospinal fluid (CSF) is the clear fluid that fills the cavities of the brain and covers the surfaces of the brain and…

Granzyme Definition Granzyme is a group of serine proteases that are released by the body’s natural killer cells and cytotoxic T-cells. When cells become infected…

Electrophoresis Definition Electrophoresis is the migration of electrically charged molecules through a fluid or gel under the influence of an electric field. Electrophoresis is used…

Hydrolysis Definition Hydrolysis is the breaking down of a chemical compound into two or more simpler compounds by reacting with water. The proteins, fats, and…

Cofactor Definition Cofactor in biochemistry is a substance, such as a metallic ion or a coenzyme that must be associated with an enzyme for the…

T-Cell Receptor Definition T-cell receptor (TCR) is one of two polypeptide chains (a or ß) on the surface of T lymphocytes that recognize and bind…

Cytotoxic T Cell Definition Cytotoxic T cell is a type of immune cell that can kill certain cells, including foreign cells, cancer cells, and cells…

Natural Killer Cell Definition Natural killer cell is a cell that can react against and destroy another cell without prior sensitization to it. It is…