Q: Which of the following equations best represents the relationship between calcium homeostasis and bone remodeling?

$$\text{Blood Ca}^{2+} \downarrow \Rightarrow \text{PTH} \uparrow \Rightarrow \text{Osteoclast activity} \uparrow \Rightarrow \text{Bone matrix degraded} \Rightarrow \text{Blood Ca}^{2+} \uparrow$$

Question 1

Which of the following best describes the primary function of the axial skeleton?

Accepted Answer

Protecting, supporting, and carrying body parts

Question 2

A patient presents with a bone that is thin, flattened, and slightly curved. Which classification does this bone most likely belong to?

Accepted Answer

Flat bone

Question 3

Which type of cartilage is found in the menisci of the knee and intervertebral discs, and what property does it provide?

Accepted Answer

Fibrocartilage; tensile strength

Question 4

What is the role of osteoclasts in bone tissue?

Accepted Answer

Degrading bone matrix and releasing calcium

Question 5

A long bone is fractured at the diaphysis. Which part of the bone is affected?

Accepted Answer

The shaft or long axis of the bone

Question 6

Which hormone is released when blood calcium levels fall below normal, and what is its effect on bone?

Accepted Answer

Parathyroid hormone (PTH); stimulates bone degradation

Question 7

If a bone lacked collagen, what would be the most likely outcome?

Accepted Answer

The bone would shatter easily under stress

Question 8

Which structure in compact bone contains blood vessels and nerves and runs parallel to the long axis of the bone?

Accepted Answer

Haversian (central) canal

Question 9

A patient with a deficiency in parathyroid hormone (PTH) would most likely experience which of the following?

Accepted Answer

Decreased bone resorption

Question 10

Which of the following best explains why trabeculae in spongy bone are aligned along lines of stress?

Accepted Answer

To resist compressive and tensile forces efficiently

Question 11

Which of the following equations best represents the relationship between calcium homeostasis and bone remodeling?

Accepted Answer

$$	ext{Blood Ca}^{2+} \downarrow \Rightarrow 	ext{PTH} \uparrow \Rightarrow 	ext{Osteoclast activity} \uparrow \Rightarrow 	ext{Bone matrix degraded} \Rightarrow 	ext{Blood Ca}^{2+} \uparrow$$

Question 12

Which of the following is NOT a function of the skeletal system?

Accepted Answer

Hormone synthesis

Question 13

A child is diagnosed with a genetic disorder that prevents the formation of osteoid. Which of the following symptoms would you expect?

Accepted Answer

Bones that are soft and flexible

Question 14

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

Accepted Answer

Osteoblast

Question 15

A patient with a tumor secreting excess calcitonin would most likely exhibit which of the following?

Accepted Answer

Increased deposition of calcium in bones

Question 16

Which of the following best describes the periosteum?

Accepted Answer

A dual-layered membrane covering the external bone surface, rich in nerves and blood vessels

Question 17

Which of the following scenarios would most likely result in increased osteoclast activity?

Accepted Answer

Prolonged immobilization (e.g., bed rest)

Question 18

Which of the following best explains why the patella is classified as a short bone?

Accepted Answer

It is generally cube-shaped and forms within a tendon

Question 19

Which of the following statements about the organic and inorganic components of bone is correct?

Accepted Answer

The organic component (osteoid) provides flexibility, while the inorganic component (mineral salts) provides hardness.

Question 20

A patient with a genetic mutation affecting canaliculi formation would most likely experience which of the following?

Accepted Answer

Impaired communication and nutrient delivery between osteocytes

Bone Composition and the Skeletal System: Structure, Function, and Regulation

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