Home › SMLE (Saudi Medical Licensing) › Physiology › The Endocrine System › Which pair of actions does parathyroid hormone p…
Which pair of actions does parathyroid hormone produce at bone and at the kidney tubules?
AInhibits osteoclasts and raises calcium excretion
BInhibits osteoblasts and raises calcium excretion
CExcites osteoclasts and raises calcium reabsorption
DExcites osteoblasts and lowers calcium reabsorption
Answer & Solution
Correct answer: C. Excites osteoclasts and raises calcium reabsorption
1. Parathyroid hormone has one goal, which is to raise blood calcium.
2. At bone it stimulates osteoclasts, which degrade bone matrix and free calcium into interstitial fluid.
3. It also inhibits osteoblasts, so calcium is not put back into bone.
4. At the kidney tubules it increases reabsorption of calcium from the filtrate rather than letting it escape in urine.
5. Any option that raises urinary calcium loss describes calcitonin, which is the opposing hormone.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 17 "The Endocrine System", section 17.5 The Parathyroid Glands_
Related questions
From which embryonic tissue does the anterior pituitary gland arise?The kidneys release erythropoietin in response to what?Stretching of the atrial wall releases atrial natriuretic peptide. What does that hormone Glucagon makes the liver take up amino acids and convert them into glucose. What is this rWhich cells take up glucose without needing insulin at all?Insulin appears to act through which kind of receptor?Insulin raises glucose uptake mainly through which cellular action?Between which two values is blood glucose concentration tightly maintained?