"Substance P" is a neurotransmitter that functions in which of the following biological processes?

A) Learning and memory
B) Mood and sleep
C) Transmits pain signals
D) Regulates food intake
E) Inhibits cardiac muscle

Substance P

A peptide neurotransmitter released by certain sensory neurons in pain pathways; signals the central nervous system regarding pain; also stimulates other structures, including smooth muscle in the digestive tract.

Neurotransmitter

Chemical substances released from neurons that transmit signals across a chemical synapse to affect other neurons, muscle cells, or gland cells.

Biological Processes

The vital processes occurring in living organisms, necessary for maintaining life, including growth, reproduction, and metabolism.