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Parathyroid Hormone (PTH) Function and Regulation

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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?

Parathyroid Hormone (PTH) Signup and view all the answers

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

Facilitates absorption of calcium ions from the intestines Signup and view all the answers

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

Estrogen Signup and view all the answers

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

Increasing blood calcium levels by promoting bone deposition Signup and view all the answers

How does calcitonin affect blood calcium levels?

Inhibits bone resorption and promotes calcium deposition in bones Signup and view all the answers

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

Promoting bone resorption Signup and view all the answers

How does estrogen influence calcium levels in the body?

Enhances bone deposition by osteoblasts Signup and view all the answers

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

Reducing urinary loss of calcium Signup and view all the answers

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

Calcitriol Signup and view all the answers

Which hormone is secreted by the anterior pituitary gland?

Growth hormone Signup and view all the answers

What is the role of calcitonin in bone metabolism?

Promotes mineralization and lowers blood Ca2+ concentration in children Signup and view all the answers

How does excess cortisol affect bone health?

Can cause osteoporosis by reducing bone deposition Signup and view all the answers

Which hormone stimulates osteoblasts and promotes protein synthesis?