Parathyroid Hormone (PTH) Function and Regulation
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Questions and Answers

Which hormone is secreted by the thyroid gland when blood calcium levels are high?

  • Growth hormone
  • Calcitonin (correct)
  • Estrogen
  • Cortisol

What is the role of Parathyroid Hormone (PTH) in relation to bone resorption?

  • Increases osteoclast activity (correct)
  • Promotes bone deposition
  • Inhibits osteoclast activity
  • Decreases calcium absorption from the gut

Which hormone is most active during bone growth in childhood and adolescence, and less so in adulthood?

  • Vitamin D
  • Estrogen (correct)
  • Cortisol
  • Calcitriol

Which hormone promotes calcium reabsorption by the kidneys, reducing calcium excretion in urine?

<p>Parathyroid Hormone (PTH) (C)</p> Signup and view all the answers

What is the primary role of Vitamin D in calcium ion homeostasis?

<p>Facilitates absorption of calcium ions from the intestines (C)</p> Signup and view all the answers

Which hormone inhibits bone deposition by suppressing collagen synthesis from osteoblasts?

<p>Estrogen (B)</p> Signup and view all the answers

What is the primary function of growth hormone in the context of calcium homeostasis?

<p>Increasing blood calcium levels by promoting bone deposition (B)</p> Signup and view all the answers

How does calcitonin affect blood calcium levels?

<p>Inhibits bone resorption and promotes calcium deposition in bones (C)</p> Signup and view all the answers

In the context of calcium balance, what is the primary role of cortisol?

<p>Promoting bone resorption (C)</p> Signup and view all the answers

How does estrogen influence calcium levels in the body?

<p>Enhances bone deposition by osteoblasts (A)</p> Signup and view all the answers

What is the main function of calcitriol (Vitamin D) in the hormonal control of calcium balance?

<p>Reducing urinary loss of calcium (C)</p> Signup and view all the answers

Which hormone plays a crucial role in promoting absorption of calcium and phosphate?

<p>Calcitriol (D)</p> Signup and view all the answers

Which hormone is secreted by the anterior pituitary gland?

<p>Growth hormone (B)</p> Signup and view all the answers

What is the role of calcitonin in bone metabolism?

<p>Promotes mineralization and lowers blood Ca2+ concentration in children (A)</p> Signup and view all the answers

How does excess cortisol affect bone health?

<p>Can cause osteoporosis by reducing bone deposition (D)</p> Signup and view all the answers

Which hormone stimulates osteoblasts and promotes protein synthesis?

<p>Growth hormone (A)</p> Signup and view all the answers

What effect does estrogen have on bone health?

<p>Prevents osteoclasts from resorbing bone (A)</p> Signup and view all the answers

What is the function of calcitriol in bone metabolism?

<p>Promotes intestinal absorption of calcium and phosphate (A)</p> Signup and view all the answers

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