During a stressful interval
A) TSH stimulates the adrenal cortex and medulla to secrete acetylcholine.
B) the alpha cells of islets secrete insulin and simultaneously the beta cells of the islets secrete glucagon.
C) ACTH stimulates the adrenal cortex, and neurons of the sympathetic nervous system stimulate the adrenal medulla.
D) the posterior pituitary gland secretes more growth hormones.
E) the calcium levels in the blood are increased due to actions of two antagonistic hormones, epinephrine and norepinephrine.

Question

Quizplus · Accepted Answer

During a stressful interval, the hypothalamus secretes corticotropin-releasing hormone (CRH), which stimulates the anterior pituitary gland to secrete adrenocorticotropic hormone (ACTH). ACTH stimulates the adrenal cortex to secrete cortisol and other glucocorticoids. Additionally, neurons of the sympathetic nervous system stimulate the adrenal medulla to secrete epinephrine and norepinephrine. Together, these hormones help the body respond to stress. Option A is incorrect because TSH stimulates the thyroid gland, not the adrenal glands. Option B is incorrect because insulin and glucagon have opposite effects on blood glucose levels and are not secreted simultaneously. Option D is incorrect because the posterior pituitary gland secretes hormones such as oxytocin and antidiuretic hormone, not growth hormone. Option E is incorrect because epinephrine and norepinephrine increase blood calcium levels indirectly by stimulating bone resorption, not directly.

During a Stressful Interval