Question

bio - 202 topic 1: cellular communication and endocrine system physiology
practice it
what is endocrine signaling?
a type of signaling that involves the release of hormones into the bloodstream
a type of signaling where the signal molecule acts on the same cell that released it
a type of signaling that occurs between adjacent cells
when a signal molecule is released into the bloodstream to reach distant target cells
a type of signaling where the signal molecule acts on cells in a different tissue

Explanation:

Endocrine signaling is characterized by the release of hormones (signaling molecules) into the bloodstream. These hormones then travel to distant target cells. The first option is too general as it just mentions hormones in bloodstream without the key aspect of acting on distant cells. The second option describes autocrine signaling. The third option is paracrine signaling (acting on adjacent cells). The fifth option is too vague as it doesn't mention the bloodstream. The fourth option precisely captures the essence of endocrine signaling - release into bloodstream to reach distant targets.

Answer:

When a signal molecule is released into the bloodstream to reach distant target cells