Q: Which equation best represents the negative feedback loop for blood calcium regulation involving parathyroid hormone?

$$Ca^{2+}$$_{blood} \downarrow \rightarrow \text{PTH secretion} \uparrow \rightarrow \text{Osteoclast activity} \uparrow \rightarrow $$Ca^{2+}$$_{blood} \uparrow$$

Q: Which of the following is a correct formula for calculating the percentage of bone replaced annually if compact bone is replaced every 10 years?

$$\text{Annual replacement} = \frac{100\%}{10} = 10\%$$

Question 1

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

Accepted Answer

They break down bone matrix, aiding in bone resorption.

Question 2

Compact bone, also known as lamellar bone, is primarily organized into which structural unit?

Accepted Answer

Osteon (Haversian system)

Question 3

Which process is responsible for the formation of most bones in the human skeleton?

Accepted Answer

Endochondral ossification

Question 4

During bone growth in length, which structure is responsible for the increase?

Accepted Answer

Epiphyseal plate

Question 5

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

Accepted Answer

Growth hormone

Question 6

A patient presents with sustained high blood calcium levels. Which of the following complications is most likely to occur?

Accepted Answer

Formation of kidney stones due to calcium salt deposits

Question 7

Which equation best represents the negative feedback loop for blood calcium regulation involving parathyroid hormone?

Accepted Answer

$$Ca^{2+}$$_{blood} \downarrow ightarrow 	ext{PTH secretion} \uparrow ightarrow 	ext{Osteoclast activity} \uparrow ightarrow $$Ca^{2+}$$_{blood} \uparrow$$

Question 8

Which of the following is TRUE regarding Wolff's law?

Accepted Answer

Bones grow or remodel in response to the demands placed on them.

Question 9

A weightlifter develops large bony projections at muscle attachment sites. This adaptation is best explained by which principle?

Accepted Answer

Wolff's law

Question 10

Which of the following best describes the sequence of events in bone fracture repair?

Accepted Answer

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

Question 11

Which type of bone cell is primarily responsible for depositing new bone matrix during bone growth and repair?

Accepted Answer

Osteoblasts

Question 12

A child suffers a fracture where the bone bends and breaks incompletely, similar to how a green twig breaks. What type of fracture is this?

Accepted Answer

Greenstick fracture

Question 13

Which of the following bones is formed by intramembranous ossification?

Accepted Answer

Parietal bone of the skull

Question 14

Which cell type is derived from osteoprogenitor cells and is responsible for synthesizing bone matrix?

Accepted Answer

Osteoblasts

Question 15

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

Accepted Answer

Lack of mechanical stress leads to reduced bone remodeling.

Question 16

Which of the following is a correct formula for calculating the percentage of bone replaced annually if compact bone is replaced every 10 years?

Accepted Answer

$$	ext{Annual replacement} = \frac{100\%}{10} = 10\%$$

Question 17

Which of the following is NOT a function of the osteon (Haversian system) in compact bone?

Accepted Answer

Facilitating bone resorption by osteoclasts

Question 18

Which hormone, produced by the thyroid gland, can lower blood calcium levels at abnormally high doses?

Accepted Answer

Calcitonin

Question 19

Which of the following best describes appositional growth in bones?

Accepted Answer

Increase in bone thickness due to osteoblast activity beneath the periosteum

Question 20

A fracture where the bone ends are out of normal alignment and the skin is penetrated is classified as:

Accepted Answer

Displaced, open (compound) fracture

Bone and Skeletal Tissue: Structure, Growth, and Development

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