Which of the following statements is TRUE? Parathyroid hormone has a direct effect on the gastrointestinal tract Parathyroid hormone increases the excretion of calcium in urine Parathyroid hormone increases osteoclast activity Parathyroid hormone decreases the expression of 1α-hydroxylase Parathyroid hormone is a steroid hormone
Question
Which of the following statements is TRUE? Parathyroid hormone has a direct effect on the gastrointestinal tract Parathyroid hormone increases the excretion of calcium in urine Parathyroid hormone increases osteoclast activity Parathyroid hormone decreases the expression of 1α-hydroxylase Parathyroid hormone is a steroid hormone
Solution
The statement "Parathyroid hormone increases osteoclast activity" is TRUE.
Here's why:
Parathyroid hormone (PTH) is a key regulator of calcium and phosphate homeostasis. It is secreted by the parathyroid glands in response to low blood calcium levels.
One of the main actions of PTH is to stimulate osteoclast activity. Osteoclasts are cells that break down bone tissue, releasing calcium and phosphate into the bloodstream. This process is known as bone resorption.
So, when blood calcium levels are low, PTH is secreted and osteoclast activity increases. This leads to more bone being broken down and more calcium being released into the blood, helping to restore calcium levels to normal.
The other statements about PTH are not true. PTH does not have a direct effect on the gastrointestinal tract, it does not increase the excretion of calcium in urine (it actually decreases it), it does not decrease the expression of 1α-hydro
Similar Questions
Which of the following statements regarding calcium homeostasis is true?Multiple ChoiceWhen blood calcium levels are too low, osteoclast activity increases.Parathyroid hormone inhibits osteoclast activity.Parathyroid hormone increases calcium loss from the kidney.Calcitonin elevates blood calcium levels.Increased osteoblast activity increases blood calcium levels.
Parathyroid hormone will increase blood calcium levels. True False
Select all direct effects of parathyroid hormone in the body.Multiple select question.Promotes calcium reabsorption by the kidneysPromotes activity of osteoclastsEnhances general cellular metabolic ratesActivates vitamin D in the kidneysDecreases blood calcium levels
15. Parathyroid hormonea. stimulates osteoblasts to lay down new bone.b. reduces blood calcium levels.c. stimulates calcitonin release.d. is produced by the thyroid gland.e. is released when blood calcium levels fall.
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