Question

question 6 (mandatory) (1.25 points) why can the same signal molecule, such as acetylcholine, elicit different responses in different target cells (e.g., skeletal muscle vs. heart muscle)? the signal molecule is metabolized differently in each cell type. the signal molecule’s concentration varies drastically between tissues. the specific receptors, relay proteins, and target proteins differ between the cells. acetylcholine has a different chemical structure in each type of cell.

Explanation:

Cell signaling specificity (like acetylcholine in different muscles) comes from different receptor, relay, and target proteins in cells. Metabolism, concentration, or chemical structure of the signal molecule don't explain this specificity. So the correct option is "The specific receptors, relay proteins, and target proteins differ between the cells."

Answer:

The specific receptors, relay proteins, and target proteins differ between the cells.