A(n) ________ Is Something That Has a Definite Composition

question 84

Short Answer

A(n) ________ is something that has a definite composition.

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Definitions:

First Messenger

Chemical signal, such as a peptide hormone, that binds to a plasma membrane receptor protein and alters the metabolism of a cell because a second messenger is activated.

Second Messenger

Chemical signal, such as cyclic AMP, that causes the cell to respond to the first messenger—a hormone bound to a plasma membrane receptor protein.

Peptide Hormone

Type of hormone that is a protein, a peptide, a glycoprotein, or is derived from an amino acid.

Hypothalamus

A region of the brain that controls a variety of functions including temperature regulation, hunger, and thirst, as well as hormones.