Q: Which of the following equations correctly represents the normal range of calcium concentration in human blood?

$$9\text{ mg}/100\text{ ml} \leq [Ca$$^{2+}$$] \leq 11\text{ mg}/100\text{ ml}$$

Question 1

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

Accepted Answer

Osteoclasts resorb bone by breaking down bone matrix.

Question 2

A patient presents with a bone fracture that occurred after a minor fall. X-rays reveal porous bone with thin trabeculae. Which bone disorder is most likely responsible for this presentation?

Accepted Answer

Osteoporosis

Question 3

Which type of cartilage is found in the intervertebral discs and pubic symphysis, and is best suited to resist compression?

Accepted Answer

Fibrocartilage

Question 4

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

Accepted Answer

Primary ossification center forms, cartilage calcifies, periosteal bud invades, secondary ossification centers appear

Question 5

Which of the following equations correctly represents the normal range of calcium concentration in human blood?

Accepted Answer

$$9	ext{ mg}/100	ext{ ml} \leq [Ca$$^{2+}$$] \leq 11	ext{ mg}/100	ext{ ml}$$

Question 6

A child presents with bowed legs and deformities of the pelvis, skull, and rib cage. Which condition is most likely, and what is the underlying cause?

Accepted Answer

Rickets due to vitamin D deficiency

Question 7

Which bone cell type is primarily responsible for synthesizing the organic components of the bone matrix?

Accepted Answer

Osteoblast

Question 8

Which of the following best explains why the diaphysis of long bones is composed primarily of compact bone?

Accepted Answer

Compact bone resists tension and compression, providing strength for weight-bearing.

Question 9

A patient with hypocalcemia is likely to experience which of the following symptoms, and why?

Accepted Answer

Muscle spasms and tetany due to increased nerve excitability

Question 10

Which of the following bone markings is correctly matched with its description?

Accepted Answer

Foramen – a round or oval opening through a bone

Question 11

Which process is responsible for the increase in the diameter (thickness) of bones during growth?

Accepted Answer

Appositional growth

Question 12

A 70-year-old woman suffers a hip fracture after a minor fall. Her X-ray shows a 'moth-eaten' appearance of bone. Which disease is most likely, and what is a key feature?

Accepted Answer

Paget’s Disease; excessive and disorganized bone remodeling

Question 13

Which of the following best describes the role of parathyroid hormone (PTH) in calcium homeostasis?

Accepted Answer

PTH stimulates osteoclasts to release calcium from bone into the blood.

Question 14

Which of the following is a correct sequence of events in the healing of a bone fracture?

Accepted Answer

Hematoma formation, fibrocartilaginous callus formation, bony callus formation, bone remodeling

Question 15

Which of the following best explains why tension and compression forces are distributed on opposite sides of a long bone during bending?

Accepted Answer

The arrangement of collagen fibers and bone matrix allows for resistance to both tension and compression.

Question 16

Which of the following is a distinguishing feature of intramembranous ossification compared to endochondral ossification?

Accepted Answer

It forms flat bones of the skull and clavicles from a fibrous membrane.

Question 17

A patient with sustained hypercalcemia is at risk for which of the following complications?

Accepted Answer

Nonresponsiveness of nerves and muscles

Question 18

Which of the following best describes the function of the epiphyseal plate in long bones?

Accepted Answer

It allows for growth in length of the bone during childhood and adolescence.

Question 19

Which of the following bone markings would most likely serve as a passageway for blood vessels or nerves?

Accepted Answer

Foramen

Question 20

A 10-year-old child suffers a greenstick fracture. Which of the following best explains why this type of fracture is more common in children?

Accepted Answer

Children’s bones contain more organic matrix, making them more flexible.

Bones and Skeletal Tissues: Structure, Function, and Disorders

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