A cell secretes a growth factor that binds to receptors on neighboring cells causing them to proliferate.This is an example of
A)paracrine signaling.
B)direct intercellular signaling.
C)endocrine signaling.
D)contact-dependent signaling.
E)autocrine signaling.

Question

Quizplus · Accepted Answer

Paracrine signaling occurs when a signal molecule (in this case, the growth factor) is secreted by a cell and binds to receptors on nearby target cells, causing a response. This is different from endocrine signaling which involves the release of hormones into the bloodstream to affect distant cells, or autocrine signaling where a cell secretes a signal molecule that binds to its own receptors. Direct intercellular signaling and contact-dependent signaling both involve direct physical contact between cells for signaling to occur.

A Cell Secretes a Growth Factor That Binds to Receptors