A chemical substance that is released into the blood by a gland and that controls or affects processes in other glands or body systems is a(n):
A) enzyme.
B) hormone.
C) leukotriene.
D) neurotransmitter.

Question

Quizplus · Accepted Answer

The definition provided matches the definition of a hormone. Enzymes catalyze chemical reactions, leukotrienes are involved in inflammation and immune response, and neurotransmitters transmit signals between nerve cells.

A Chemical Substance That Is Released into the Blood by a Gland