Parathyroid Hormone and Calcium Regulation Quiz

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9 Questions

Which cells in the adrenal medulla are considered modified sympathetic postganglionic neurons lacking axons and dendrites and specialized as secretory cells?

Chromaffin cells

What is the function of norepinephrine in the adrenal medulla?

Constricts vessels of the digestive system and skin

What is the primary hormone secreted by chromaffin cells in the adrenal medulla?


What triggers the release of epinephrine and norepinephrine from the adrenal medulla?

Preganglionic sympathetic neurons

What is the function of the adrenal medulla during normal activities?

Secretes small quantities of epinephrine and norepinephrine

Which blood vessels penetrate the adrenal gland capsule independently and form a subcapsular arterial plexus?

Suprarenal arteries

Which cells in the adrenal medulla contain electron-dense granules for storage and secretion of catecholamines?

Chromaffin cells

What is the dual blood supply of the adrenal medulla?

Arterial blood from the medullary arterioles and venous blood from the cortical capillaries

How does the adrenal gland receive its blood supply?

Through a subcapsular arterial plexus

Test your knowledge of the effects of parathyroid hormone (PTH) on blood calcium levels and its role in calcium reabsorption in the renal cortex and calcium absorption in the small intestines. Learn about age-related changes in the parathyroid gland.

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