Which example illustrates how a paracrine signal functions in the human body?
A) Cells in the thyroid secrete a chemical signal that stimulates the adrenal cortex near the kidneys to secrete another chemical signal.
B) A cell in a developing embryo has a cell surface protein that directly contacts a receptor on a neighboring cell, causing it to change its gene expression pattern.
C) When the skin is injured, chemical signals are sent from nearby blood cells to aid in healing.
D) T lymphocytes secrete a chemical signal that self-stimulates those same T lymphocytes to undergo cell division.
E) A cancer cell secretes a chemical signal that binds to receptors on the same cancer cell, stimulating the cell to begin replicating its DNA.

Question

Quizplus · Accepted Answer

When the skin is injured, the cells in the area secrete chemical signals, called cytokines, that attract nearby blood cells to aid in the healing process. This is an example of paracrine signaling, where cells release signals that act on nearby cells to coordinate a response.

Which Example Illustrates How a Paracrine Signal Functions in the Human