An increased heart rate caused by the release of adrenaline from the adrenal glands is an example of _____ signaling.
A)autocrine
B)contact-dependent
C)paracrine
D)endocrine

Question

Quizplus · Accepted Answer

Endocrine signaling involves the release of hormones from endocrine glands, such as the adrenal glands, into the bloodstream to travel to target cells throughout the body. Adrenaline (epinephrine) is a hormone that increases heart rate and is released by the adrenal glands in response to stress or danger. Autocrine, contact-dependent, and paracrine signaling involve communication between adjacent or nearby cells, but not through the bloodstream.

An Increased Heart Rate Caused by the Release of Adrenaline