Answer
Explanation of Adrenal Medullary Hormone Functions
A. It causes pupillary constriction
❌ Incorrect
Adrenal medullary hormones cause pupillary dilation (mydriasis), not constriction. This enhances vision during stress. Pupillary constriction is a parasympathetic effect.
❌ Incorrect
Adrenal medullary hormones cause pupillary dilation (mydriasis), not constriction. This enhances vision during stress. Pupillary constriction is a parasympathetic effect.
B. It is a hyperglycemic hormone
✅ Correct
Epinephrine increases blood glucose levels by promoting glycogenolysis and gluconeogenesis. This makes it a hyperglycemic hormone, providing energy in stress conditions.
✅ Correct
Epinephrine increases blood glucose levels by promoting glycogenolysis and gluconeogenesis. This makes it a hyperglycemic hormone, providing energy in stress conditions.
C. It causes piloerection
✅ Correct
Piloerection (goosebumps) is caused by sympathetic stimulation, which includes the effect of norepinephrine secreted by the adrenal medulla.
✅ Correct
Piloerection (goosebumps) is caused by sympathetic stimulation, which includes the effect of norepinephrine secreted by the adrenal medulla.
D. It increases strength of heart contraction
✅ Correct
Epinephrine has a positive inotropic effect—it increases the strength of heart contractions, enhancing cardiac output during fight or flight responses.
✅ Correct
Epinephrine has a positive inotropic effect—it increases the strength of heart contractions, enhancing cardiac output during fight or flight responses.
✅ Correct Answer: (2) B, C and D Only
These functions reflect the classic sympathetic responses mediated by adrenal medullary hormones during stress.
These functions reflect the classic sympathetic responses mediated by adrenal medullary hormones during stress.