Which of the following signaling molecules would you expect to travel the LONGEST distance in the human body?
A)testosterone
B)Delta
C)PDGF
D)neurotransmitters
E)Notch

Question

Quizplus · Accepted Answer

Testosterone is a steroid hormone that travels through the bloodstream and can reach distant target cells in various parts of the body, making it likely to travel the longest distance. Delta is a cell surface-bound signaling molecule involved in cell-cell communication in local tissues. PDGF is a growth factor that acts locally to stimulate cell growth and division. Neurotransmitters act locally at synapses between nerve cells. Notch is a transmembrane receptor involved in intercellular communication, but it mostly acts locally as well.

Which of the Following Signaling Molecules Would You Expect to Travel