Q: Which of the following equations correctly represents the relationship between calcium homeostasis and parathyroid hormone (PTH) activity?

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

Question 1

Which of the following best describes the primary function of osteoclasts in bone tissue?

Accepted Answer

Osteoclasts break down bone matrix, releasing calcium into the blood.

Question 2

A patient presents with bowed legs and enlarged bone ends. Laboratory tests reveal low serum calcium and vitamin D levels. Which bone disorder is most likely?

Accepted Answer

Rickets

Question 3

Which hormone is primarily responsible for stimulating osteoclast activity when blood calcium levels fall below homeostatic range?

Accepted Answer

Parathyroid hormone (PTH)

Question 4

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

Accepted Answer

Ossification center forms, cartilage calcifies, periosteal bud invades, diaphysis elongates, epiphyses ossify

Question 5

Which of the following best explains why weight-bearing exercise helps prevent osteoporosis?

Accepted Answer

It stimulates osteoblasts to deposit more bone matrix in response to mechanical stress.

Question 6

A 70-year-old woman suffers a hip fracture after a minor fall. Her bone density scan shows significant loss of spongy bone in the femoral neck. Which process most likely exceeds bone deposition in her case?

Accepted Answer

Bone resorption

Question 7

Which of the following is a correct statement about the chemical composition of bone?

Accepted Answer

Collagen fibers in osteoid provide tensile strength and flexibility.

Question 8

A child’s X-ray shows an epiphyseal plate that is thinner than normal for their age. Which hormone imbalance could most likely explain this finding?

Accepted Answer

Deficit of thyroid hormone

Question 9

Which of the following best describes the role of the periosteum in bone physiology?

Accepted Answer

It covers the external surface of bone, contains osteogenic cells, and serves as an anchoring point for tendons and ligaments.

Question 10

Which of the following equations correctly represents the relationship between calcium homeostasis and parathyroid hormone (PTH) activity?

Accepted Answer

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

Question 11

Which of the following bone cells is primarily responsible for synthesizing new bone matrix during bone growth and repair?

Accepted Answer

Osteoblast

Question 12

A patient with a history of chronic kidney disease develops soft, weak bones. Which mechanism best explains this finding?

Accepted Answer

Impaired activation of vitamin D leads to poor calcium absorption and osteomalacia.

Question 13

Which of the following best describes Wolff’s law as it applies to bone remodeling?

Accepted Answer

Bones grow or remodel in response to the mechanical stresses placed upon them.

Question 14

Which of the following is NOT a function of bone?

Accepted Answer

Synthesis of vitamin D

Question 15

A 16-year-old male is still growing in height. Which process is primarily responsible for the lengthening of his long bones?

Accepted Answer

Interstitial growth at the epiphyseal plate

Question 16

Which of the following best describes the difference between compact and spongy bone?

Accepted Answer

Compact bone is dense and forms the outer layer of bones, while spongy bone consists of trabeculae and is found inside bones.

Question 17

A patient is diagnosed with Paget’s disease. Which of the following findings would you expect on a bone scan?

Accepted Answer

Excessive and disorganized bone remodeling with a high ratio of spongy to compact bone

Question 18

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

Accepted Answer

Hematoma forms, fibrocartilaginous callus forms, bony callus forms, bone remodeling occurs

Question 19

Which of the following is a correct pairing of bone shape and example?

Accepted Answer

Flat bone – sternum

Question 20

Which of the following best explains why the medullary cavity of long bones contains yellow marrow in adults?

Accepted Answer

Yellow marrow stores triglycerides for energy.

Bones and Skeletal Tissues: Structure, Function, and Development

Study Guide - Practice Questions

Study Guide - Flashcards