$$ \text{Bone Strength} \propto [Ca$$^{2+}$$] $$

Question 1

Which of the following best describes endochondral ossification?

Accepted Answer

Bone replaces a hyaline cartilage model through a multi-step process.

Question 2

During endochondral ossification, what is the primary event that marks the transition from cartilage to bone at puberty?

Accepted Answer

Epiphyseal cartilage narrows and is replaced by bone, resulting in epiphyseal closure.

Question 3

Which bones are formed by intramembranous ossification?

Accepted Answer

Roofing bones of the skull, lower jaw, collarbone, and sesamoid bones.

Question 4

A child presents with short, stocky limbs but a normal-sized trunk. Which bone growth disorder is most likely responsible?

Accepted Answer

Achondroplasia

Question 5

Which of the following is a consequence of excessive cartilage formation at the epiphyseal cartilages?

Accepted Answer

Very tall stature with long, slender limbs, as seen in Marfan syndrome.

Question 6

Which fracture type is most likely to occur in children due to their long bones not being fully ossified?

Accepted Answer

Greenstick fracture

Question 7

A patient with a pituitary tumor before puberty is most likely to develop which condition?

Accepted Answer

Gigantism

Question 8

Which of the following best explains the role of the skeleton in calcium homeostasis?

Accepted Answer

The skeleton stores calcium and releases it into the blood, which weakens bones.

Question 9

Which organ is NOT directly involved in maintaining calcium homeostasis?

Accepted Answer

Liver

Question 10

A fracture that projects through the skin and poses a risk of infection is called:

Accepted Answer

Open (compound) fracture

Question 11

Which of the following equations best represents the relationship between calcium ion concentration and bone strength?

Accepted Answer

$$ 	ext{Bone Strength} \propto [Ca$$^{2+}$$] $$

Question 12

A patient develops thickening of facial bones, jaw, and hands after the epiphyseal plates have closed. Which condition is most likely?

Accepted Answer

Acromegaly

Question 13

Which fracture type is most likely to result in abnormal bone arrangements?

Accepted Answer

Displaced fracture

Question 14

Which of the following best describes the process of appositional bone growth?

Accepted Answer

Bone grows in diameter by depositing new bone matrix on the outer surface.

Question 15

Which of the following is a real-life consequence of a poorly monitored epiphyseal fracture in a child?

Accepted Answer

Permanent cessation of bone growth at the fracture site.

Question 16

Which of the following best describes the pathophysiology of fibrodysplasia ossificans progressiva (FOP)?

Accepted Answer

Gene mutation causing bone deposition around skeletal muscles, resulting in heterotopic bones.

Question 17

Which fracture is most likely to occur at the ankle and affect both the medial malleolus of the tibia and lateral malleolus of the fibula?

Accepted Answer

Pott’s (bimalleolar) fracture

Question 18

Which of the following best explains why calcium concentration must be tightly regulated in the body?

Accepted Answer

Calcium is vital for muscle contraction, blood coagulation, and nerve impulse generation.

Question 19

Which of the following best describes the hormonal control of calcium homeostasis?

Accepted Answer

Intestines, bones, and kidneys respond to hormones to maintain calcium levels.

Bone Development, Growth, and Repair: Study Notes (Chapter 6 Modules 6.7–12)

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