Q: Which equation best represents the negative feedback loop controlling blood calcium levels?

$$\text{Low Ca}^{2+} \rightarrow \text{PTH release} \rightarrow \text{Osteoclast activation} \rightarrow \text{Ca}^{2+} \text{ released from bone} \rightarrow \text{Blood Ca}^{2+} \text{ rises}$$

Question 1

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

Accepted Answer

Appositional growth involves cartilage-forming cells in the perichondrium secreting matrix against the external face of existing cartilage, while interstitial growth occurs when chondrocytes within lacunae divide and secrete new matrix, expanding cartilage from within.

Question 2

Which function of bone is directly related to the process of hematopoiesis?

Accepted Answer

Blood cell formation

Question 3

A patient presents with bowed legs and enlarged bone ends. Laboratory tests reveal a vitamin D deficiency. Which bone disorder is most likely present?

Accepted Answer

Rickets

Question 4

Which of the following is NOT a component of the organic matrix of bone?

Accepted Answer

Hydroxyapatite

Question 5

During bone remodeling, which cell type is primarily responsible for bone resorption?

Accepted Answer

Osteoclasts

Question 6

Which hormone is released in response to low blood calcium levels and stimulates osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 7

What is the structural unit of compact bone?

Accepted Answer

Osteon (Haversian system)

Question 8

Which of the following best explains why weight lifters have thicker bones at muscle attachment sites?

Accepted Answer

Mechanical stress stimulates bone remodeling, leading to increased bone deposition where muscles exert force.

Question 9

Which equation best represents the negative feedback loop controlling blood calcium levels?

Accepted Answer

$$	ext{Low Ca}^{2+} ightarrow 	ext{PTH release} ightarrow 	ext{Osteoclast activation} ightarrow 	ext{Ca}^{2+} 	ext{ released from bone} ightarrow 	ext{Blood Ca}^{2+} 	ext{ rises}$$

Question 10

Which of the following is true regarding the epiphyseal plate?

Accepted Answer

It is the site of longitudinal bone growth during childhood.

Question 11

A fracture that breaks the bone all the way through and penetrates the skin is classified as:

Accepted Answer

Complete and open (compound)

Question 12

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

Accepted Answer

Hematoma formation occurs first, followed by fibrocartilaginous callus formation, then bony callus formation, and finally bone remodeling.

Question 13

Which of the following is a major difference between compact and spongy bone?

Accepted Answer

Spongy bone contains trabeculae, while compact bone contains osteons.

Question 14

Which of the following best explains why bones of bedridden patients become featureless?

Accepted Answer

Lack of mechanical stress leads to reduced bone remodeling and deposition.

Question 15

Which of the following zones in the epiphyseal plate is responsible for the division of cartilage cells?

Accepted Answer

Proliferation zone

Question 16

Which of the following is true regarding the conversion of yellow marrow to red marrow?

Accepted Answer

It occurs in response to anemia.

Question 17

Which of the following best describes the role of osteocytes?

Accepted Answer

They maintain bone matrix and act as stress or strain sensors.

Question 18

Which of the following is a consequence of osteoporosis?

Accepted Answer

Decline in bone mass with normal matrix, leading to increased risk of vertebral and hip fractures

Question 19

Which equation best represents the relationship between bone mass recycling and time?

Accepted Answer

$$	ext{Spongy bone replaced every 3-4 years}$$

Bones and Skeletal Tissues: Structure, Function, Growth, and Disorders

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