Q: Which equation best represents the relationship between blood calcium levels and parathyroid hormone (PTH) release?

$$\text{If } [Ca$$^{2+}$$]_{blood} \downarrow \text{ then } \text{PTH release} \uparrow$$

Question 1

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

Accepted Answer

Cartilage has a flexible extracellular matrix made by chondroblasts and lacks mineralization.

Question 2

A patient presents with severe pain and deformities in long bones. Blood tests reveal low calcium and vitamin D levels. Which bone disorder is most likely?

Accepted Answer

Osteomalacia (Rickets in children)

Question 3

Which bone cell type is primarily responsible for bone resorption and increases its activity in response to parathyroid hormone (PTH)?

Accepted Answer

Osteoclast

Question 4

During endochondral ossification, what is the first event that occurs in the diaphysis of a developing long bone?

Accepted Answer

Blood vessel infiltration of perichondrium converting it to periosteum

Question 5

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

Accepted Answer

Production of digestive enzymes

Question 6

A bone is classified as a 'flat bone.' Which of the following is an example?

Accepted Answer

Sternum

Question 7

Which equation best represents the relationship between blood calcium levels and parathyroid hormone (PTH) release?

Accepted Answer

$$	ext{If } [Ca$$^{2+}$$]_{blood} \downarrow 	ext{ then } 	ext{PTH release} \uparrow$$

Question 8

Which bone structure is responsible for anchoring tendons and ligaments to the bone matrix?

Accepted Answer

Sharpey's fibers

Question 9

Which process allows bones to increase in thickness throughout life?

Accepted Answer

Appositional growth

Question 10

Which of the following best describes the chemical composition of bone that provides tensile strength and flexibility?

Accepted Answer

Collagen fibers in osteoid

Question 11

A fracture is classified as 'open' if:

Accepted Answer

The skin is penetrated by the broken bone

Question 12

Which bone cell acts as a stress or strain sensor and communicates with osteoblasts and osteoclasts?

Accepted Answer

Osteocyte

Question 13

Which of the following best describes the arrangement of collagen fibers in adjacent lamellae of an osteon?

Accepted Answer

Collagen fibers run in different directions in adjacent lamellae

Question 14

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

Accepted Answer

Yellow marrow can convert to red marrow if necessary, such as during increased hematopoietic demand.

Question 15

Which of the following bone disorders is characterized by excessive bone resorption and deposition, resulting in spotty weakening and reduced mineralization?

Accepted Answer

Paget's Disease

Question 16

Which of the following is a real-life consequence of sustained high blood calcium levels (hypercalcemia)?

Accepted Answer

Deposits of calcium salts in blood vessels and kidneys, interfering with function

Question 17

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.

Question 18

Which of the following is a site for muscle and ligament attachment created by muscle pull or joint modifications?

Accepted Answer

Iliac crest

Question 19

Which of the following equations best represents the mineral composition of bone responsible for its hardness?

Accepted Answer

$$	ext{Bone hardness} \propto 	ext{Hydroxyapatite (Ca}_{10}	ext{(PO}_4	ext{)}_6	ext{(OH)}_2	ext{)}$$

Question 20

Which of the following best describes the role of osteocalcin produced by bone?

Accepted Answer

Regulates insulin secretion and protects against obesity and diabetes mellitus.

Bones and Skeletal Tissues: Structure, Function, and Development

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