Question

In circumstances where the body requires prolonged levels of a hormoneś activity, target cells will synthesis and express more receptors on the surface of the cells of the target organ, This is known as ???

A. The cellś sensitivity reaction B. cellular affinity C. Up regulation D. A reaction to a stressor

Answer 1

Option C. Up regulation.

Up regulation occurs when a cell produces more receptors, the cell decreases its degradation of receptors or by activating already present recpetors. Cells typically up regulate when the concentration of a hormone is very little. If there is a lower concentration of a hormone in the blood stream and the cell increases the number of receptors, it increases the chances of interacting with that hormone (sensitivity). Hormones themselves can also cause cells to up regulate.