Q: Which of the following equations correctly represents the relationship between blood calcium levels and parathyroid hormone (PTH) release?

$$\downarrow \text{Blood } Ca$$^{2+}$$ \rightarrow \uparrow \text{PTH release} \rightarrow \uparrow \text{Osteoclast activity} \rightarrow \uparrow \text{Blood } Ca$$^{2+}$$

Question 1

Which of the following statements best explains why cartilage is more flexible than bone?

Accepted Answer

Cartilage contains a flexible extracellular matrix made by chondroblasts, while bone contains a rigid matrix due to inorganic calcium salts.

Question 2

A patient presents with a fracture in the shaft of their femur. Which anatomical term best describes this region of the bone?

Accepted Answer

Diaphysis

Question 3

Which type of bone cell is primarily responsible for bone resorption and what is its origin?

Accepted Answer

Osteoclast; derived from hematopoietic stem cells that become macrophages

Question 4

During endochondral ossification, what is the correct sequence of events?

Accepted Answer

Bone collar forms, central cartilage calcifies, periosteal bud invades, diaphysis elongates, epiphyses ossify

Question 5

Which of the following best describes the function of osteocytes?

Accepted Answer

Monitor and maintain the bone matrix and act as stress or strain sensors

Question 6

A 70-year-old woman presents with a vertebral fracture after minimal trauma. Which bone disorder is most likely responsible?

Accepted Answer

Osteoporosis

Question 7

Which of the following equations correctly represents the relationship between blood calcium levels and parathyroid hormone (PTH) release?

Accepted Answer

$$\downarrow 	ext{Blood } Ca$$^{2+}$$ ightarrow \uparrow 	ext{PTH release} ightarrow \uparrow 	ext{Osteoclast activity} ightarrow \uparrow 	ext{Blood } Ca$$^{2+}$$

Question 8

Which of the following is a function of the skeletal system that directly contributes to homeostasis of blood glucose?

Accepted Answer

Production of osteocalcin, which regulates insulin secretion

Question 9

A child with bowed legs and pain in the lower limbs is diagnosed with rickets. What is the most likely underlying cause?

Accepted Answer

Insufficient calcium or vitamin D deficiency leading to poorly mineralized bones

Question 10

Which of the following best describes the difference between appositional and interstitial growth in cartilage?

Accepted Answer

Appositional growth adds new matrix to the surface, while interstitial growth expands cartilage from within

Question 11

Which of the following bone markings is correctly matched with its function?

Accepted Answer

Foramen – conduit for blood vessels and nerves

Question 12

Which of the following statements about compact and spongy bone is correct?

Accepted Answer

Compact bone contains osteons (Haversian systems), while spongy bone contains trabeculae aligned along lines of stress

Question 13

A 15-year-old male is still growing in height. Which process is primarily responsible for the increase in length of his long bones?

Accepted Answer

Interstitial growth at the epiphyseal plate

Question 14

Which of the following is a correct description of the chemical composition of bone?

Accepted Answer

Bone is composed of organic osteoid (mainly collagen) and inorganic hydroxyapatite (calcium phosphate crystals)

Question 15

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's mineral composition provides resistance to compression, while collagen fibers provide tensile strength

Question 16

Which of the following is NOT a function of the periosteum?

Accepted Answer

Providing a site for hematopoiesis

Question 17

A patient with Paget's disease is most likely to have which of the following bone abnormalities?

Accepted Answer

Excessive and haphazard bone deposition and resorption, leading to spotty weakening

Question 18

Which of the following best describes the process of bone remodeling?

Accepted Answer

Bone remodeling involves both bone deposit by osteoblasts and bone resorption by osteoclasts, regulated by hormonal and mechanical factors

Question 19

Which of the following is a correct statement about the epiphyseal plate during bone growth?

Accepted Answer

The epiphyseal plate maintains a constant thickness because the rate of cartilage growth is balanced by bone replacement

Chapter 6: Bones and Skeletal Tissues – Comprehensive Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards