Oxytocin communicates the need for contractions during childbirth. Oxytocin is an example of what type of protein?

enzyme

motor protein

sensory proteins

signaling protein

Signaling protein

Explanation:

Oxytocin is a hormone that produces in the hypothalamus and transport to the pituitary gland which excretes it in the bloodstream. It is actually a neurotransmitter kind of hormone that's why it's a signaling protein. When it's level raises in the blood it produces strong contractions in the uterine wall during the childbirth process.