Three types of chemical messengers are:
A) neurotransmitters, endorphins, and hormones.
B) excitatory neurotransmitters, inhibitory neurotransmitters, and endorphins.
C) sodium, potassium, and neurotransmitters.
D) excitatory neurotransmitters, inhibitory neurotransmitters, and hormones.

Question

Quizplus · Accepted Answer

Neurotransmitters are chemical messengers that are released by neurons to transmit signals to other neurons, muscles, or glands. Endorphins are also neurotransmitters, but these are specialized to block pain signals and produce a feeling of euphoria. Hormones are chemical messengers that are produced by glands, such as the pituitary gland or adrenal gland, and are carried in the bloodstream to target organs to regulate physiological processes.

Three Types of Chemical Messengers Are