Q: Which of the following equations correctly represents the negative feedback regulation of blood calcium by parathyroid hormone (PTH)?

$\text{Low } [Ca^{2+}]_{blood} \rightarrow \text{PTH secretion} \rightarrow \text{Osteoclast activation} \rightarrow \text{Bone resorption} \rightarrow \text{Increase } [Ca^{2+}]_{blood}$

Question 1

Which of the following bones is classified as a flat bone?

Accepted Answer

Sternum

Question 2

What is the primary function of osteoclasts in bone remodeling?

Accepted Answer

Break down bone matrix by secreting lysosomal enzymes and protons

Question 3

Which hormone is most important for stimulating epiphyseal plate activity during childhood?

Accepted Answer

Growth hormone

Question 4

A patient presents with abnormally high blood calcium levels. Which hormone would be secreted in response, and what is its effect?

Accepted Answer

Calcitonin; decreases blood calcium levels

Question 5

Which of the following best describes the structure and function of the osteon (Haversian system)?

Accepted Answer

A cylinder of bone matrix with concentric lamellae that withstands stress and resists twisting

Question 6

During endochondral ossification, which tissue is replaced by bone?

Accepted Answer

Hyaline cartilage

Question 7

Which of the following equations correctly represents the negative feedback regulation of blood calcium by parathyroid hormone (PTH)?

Accepted Answer

$	ext{Low } [Ca^{2+}]_{blood} ightarrow 	ext{PTH secretion} ightarrow 	ext{Osteoclast activation} ightarrow 	ext{Bone resorption} ightarrow 	ext{Increase } [Ca^{2+}]_{blood}$

Question 8

Which component of bone is primarily responsible for its tensile strength and flexibility?

Accepted Answer

Osteoid (collagen fibers and ground substance)

Question 9

A weightlifter develops large bony projections at muscle attachment sites. Which law explains this adaptation?

Accepted Answer

Wolff's Law

Question 10

Which of the following best describes the process of bone repair after a fracture?

Accepted Answer

Hematoma formation, fibrocartilaginous callus formation, bony callus formation, bone remodeling

Question 11

If osteoclast activity exceeds osteoblast activity in a long bone, what will happen to bone mass?

Accepted Answer

Bone mass will decrease

Question 12

Which of the following is true regarding the location of red marrow in adults?

Accepted Answer

It is most active in the flat bone plates and some irregular bones

Question 13

Which membrane covers the internal surfaces of bone, including the trabeculae of spongy bone?

Accepted Answer

Endosteum

Question 14

Which of the following best explains why bone is half as strong as steel in resisting compression but as strong as steel in resisting tension?

Accepted Answer

Bone contains both organic (collagen) and inorganic (hydroxyapatite) components

Question 15

Which process allows bones to grow in thickness during postnatal development?

Accepted Answer

Appositional growth

Question 16

A patient with anemia may have yellow marrow converted to red marrow. What is the physiological significance of this change?

Accepted Answer

Enhanced hematopoiesis to produce more blood cells

Question 17

Which of the following best describes the role of canaliculi in compact bone?

Accepted Answer

They connect lacunae and allow communication between osteocytes

Question 18

Which of the following is NOT a function of bone?

Accepted Answer

Production of digestive enzymes

Question 19

Which type of bone growth is responsible for the lengthening of long bones during childhood and adolescence?

Accepted Answer

Interstitial growth at the epiphyseal plate

Question 20

Which of the following best describes the difference between bone growth and bone remodeling?

Accepted Answer

Bone growth increases bone size, while bone remodeling maintains bone shape and strength

Chapter 6: Bone and Skeletal Tissues – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards