Question

Consider the following statements regarding function of adrenal medullary hormones:

1. It causes pupilary constriction.
2. It is a hyperglycemic hormone.
3. It causes piloerection.
4. It increases the strength of heart contractions.

Choose the correct answer from the options given below:

Options

• C and D only

• B, C and D only

• A, C and D only

• D only

Answer 1

B, C and D only

Explanation:

Norepinephrine (noradrenaline) and adrenaline (epinephrine) are secreted by the adrenal medulla. Pupils dilate rather than constrict when exposed to adrenaline. By promoting glycogenolysis, these hormones raise blood glucose levels (hyperglycemia). Hair standing on end, or piloerection, is a sympathetic reaction. Heart rate and contraction strength are both increased by adrenaline.