17 Questions
Which hormone increases plasma [Ca2+] and decreases plasma [Pi] levels?
Parathyroid hormone (PTH)
What is the active form of Vitamin D?
1,25(OH)2D3.
Which hormone decreases plasma [Ca2+] and [Pi] levels?
Calcitonin
Which hormone increases plasma [Ca2+] and [Pi] levels?
Vitamin D
Which of the following is NOT a function of PTH (parathyroid hormone)?
Increase calcium absorption in the intestines
Which of the following is responsible for the regulation of PTH secretion?
Calcium levels in the blood
What is the active form of vitamin D?
Calcitriol
What is the primary response to hypocalcemia?
Increased PTH secretion
Which of the following is the key factor that determines the threshold voltage to fire an action potential in the presence of hypocalcemia?
Voltage-gated Na channels activation
What is the most common cause of rickets in a growing person?
Deficiency in Vitamin D production and activation
What is the characteristic feature of osteoporosis?
Progressive loss of bone matrix
What is the most expected effect of treating animals with an antiCaSR (Ca-sensing receptor) antibody to block CaSR?
Increased PTH synthesis
Which form of calcium is physiologically active?
Ionized (free) calcium
What percentage of total plasma calcium concentration is bound to protein (albumin)?
45%
Which of the following actions is NOT regulated by vitamin D?
Stimulating PTH secretion
How does calcitriol increase calcium absorption in the small intestine?
By stimulating synthesis of calcium binding protein
What effect does calcitonin have on bone resorption?
It inhibits osteoclast activity
Test your knowledge on calcium and phosphorus functions, balance, and homeostasis. Explore topics such as hormonal regulation, disorders, and more.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
