Which type of cell signaling does not rely on the diffusion of a chemical signal molecule?
A)contact-dependent
B)paracrine
C)autocrine
D)endocrine
E)All of these choices are correct.

Question

Quizplus · Accepted Answer

Contact-dependent signaling involves direct physical contact between cells, rather than the diffusion of a chemical signal molecule. Paracrine signaling involves the diffusion of molecules over short distances. Autocrine signaling involves cells responding to signals they themselves produced, which requires some diffusion. Endocrine signaling involves the release of hormones into the bloodstream for distribution throughout the body, which also requires diffusion. Therefore, only contact-dependent signaling does not rely on the diffusion of a chemical signal molecule.

Which Type of Cell Signaling Does Not Rely on the Diffusion