Glossary A

ACTH or Adrenocorticotropic hormone is the hormone that stimulates the human adrenal cortex to release cortisol and the rat adrenal gland to release corticosterone

Actigraph refers to a small electronic device that is worn on the wrist like a watch and records body movements.

Actin is a structural protein of muscle that works with myosin in permitting muscular contraction.
Action includes motor activities, such as moving the head or eyes and locomoting through the environment.

Action component is how a person tends to act toward the object of an attitude.

- Action potential : Action potential refers to a brief change in electrical voltage that occurs between the inside and the outside of an axon when a neuron is stimulated; it serves to produce an electrical impulse.

Action Potential refers to the all-or-none electrical event in the neuron or muscle cell in which the polarity of the cell membrane is rapidly reversed and then reestablished. Moreover, it is an electrical potential across the neuron membrane. The action potential spreads down the axon as the voltage-controlled sodium channels open up sequentially, like falling dominoes.