Question 1

Which hormone is primarily responsible for increasing blood calcium levels by stimulating osteoclast activity and promoting calcium reabsorption in the kidneys?

Accepted Answer

Parathyroid hormone (PTH)

Question 2

A patient presents with a fracture that is slow to heal. Which factor is LEAST likely to contribute to delayed bone healing?

Accepted Answer

Excessive nerve stimulation

Question 3

During bone remodeling, which process is responsible for the breakdown of bone matrix?

Accepted Answer

Osteoclast activity

Question 4

Which equation best represents the relationship between calcium intake, absorption, and excretion in maintaining calcium balance?

Accepted Answer

$Ca_{balance} = Ca_{intake} - Ca_{excretion}$

Question 5

A patient with hyperparathyroidism is likely to experience which of the following effects on bone physiology?

Accepted Answer

Increased bone resorption and elevated blood calcium levels

Question 6

Which of the following best describes the role of calcitonin in calcium homeostasis?

Accepted Answer

Inhibits osteoclast activity, lowering blood calcium levels

Question 7

A young athlete suffers a greenstick fracture. Which statement best explains why this type of fracture is more common in children?

Accepted Answer

Children's bones contain more collagen and are less mineralized, making them more flexible.

Question 8

Which of the following scenarios would most likely result in increased bone remodeling?

Accepted Answer

Regular weight-bearing exercise

Question 9

If a patient has a diet deficient in vitamin D, which physiological process will be most directly affected?

Accepted Answer

Calcium absorption from the intestines

Question 10

Which of the following is a direct effect of parathyroid hormone (PTH) on the kidneys?

Accepted Answer

Increased calcium reabsorption

Question 11

A patient with osteoporosis is prescribed a medication that inhibits osteoclasts. What is the expected effect on bone physiology?

Accepted Answer

Decreased bone resorption and increased bone density

Question 12

Which of the following best explains why bones require a rich blood supply?

Accepted Answer

To provide oxygen and nutrients for bone cells and remove metabolic waste

Question 13

Which hormone is released in response to high blood calcium levels and acts to decrease those levels?

Accepted Answer

Calcitonin

Question 14

A patient with chronic kidney disease is at risk for hypocalcemia. Which mechanism best explains this phenomenon?

Accepted Answer

Decreased activation of vitamin D leads to reduced intestinal calcium absorption

Question 15

Which of the following is NOT a direct factor impacting bone development?

Accepted Answer

Blood pressure

Question 16

Which equation best represents the process of bone remodeling involving both resorption and formation?

Accepted Answer

$Bone_{remodeling} = Bone_{resorption} + Bone_{formation}$

Question 17

A patient with a parathyroid tumor has persistently high blood calcium levels. Which of the following is the most likely consequence for their bones?

Accepted Answer

Decreased bone mass due to excessive bone resorption

Question 18

Which of the following best describes the effect of physical activity on bone physiology?

Accepted Answer

Physical activity stimulates osteoblasts, increasing bone formation and strength.

Question 19

A patient with low dietary calcium and vitamin D is most at risk for which condition?

Accepted Answer

Osteoporosis

Question 20

Which of the following is the primary function of nerves within bone tissue?

Accepted Answer

Transmission of pain and proprioceptive signals

Bone Physiology and Calcium Homeostasis: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards