$9 \text{--} 11\, \mathrm{mg/dL}$

Question 1

Which of the following bones is formed by intramembranous ossification?

Accepted Answer

Clavicle

Question 2

During endochondral ossification, what is the primary template for bone formation?

Accepted Answer

Hyaline cartilage

Question 3

Which hormone is primarily responsible for stimulating osteoclast activity and increasing blood calcium levels?

Accepted Answer

Parathyroid hormone (PTH)

Question 4

A child with low dietary calcium and vitamin D is at risk for which bone disorder?

Accepted Answer

Rickets

Question 5

What is the correct sequence of events in fracture repair?

Accepted Answer

Hematoma formation → Fibrocartilaginous callus formation → Bony callus formation → Bone remodeling

Question 6

Which of the following best describes the role of osteoblasts in bone remodeling?

Accepted Answer

Bone deposition

Question 7

A patient has elevated blood calcium levels. Which hormone is likely to be secreted to lower these levels, and what is its effect on bone cells?

Accepted Answer

Calcitonin; stimulates osteoblasts

Question 8

Which structure allows for lengthwise growth of long bones during adolescence?

Accepted Answer

Epiphyseal plate

Question 9

What is the main function of osteoclasts in bone tissue?

Accepted Answer

Resorb bone by secreting HCl and collagenase

Question 10

Which of the following equations correctly represents the normal range of plasma calcium concentration?

Accepted Answer

$9 	ext{--} 11\, \mathrm{mg/dL}$

Question 11

A 16-year-old patient presents with unusually short stature. Lab results show low growth hormone levels. Which condition is most likely?

Accepted Answer

Pituitary dwarfism

Question 12

Which process is responsible for the closure of the epiphyseal plate at the end of puberty?

Accepted Answer

Decreased growth hormone and increased sex hormones

Question 13

Which of the following is a consequence of excessive osteoclast activity?

Accepted Answer

Osteoporosis

Question 14

Which of the following best explains why the cranium must rapidly expand during fetal development?

Accepted Answer

To accommodate growth of the brain

Question 15

Which of the following is TRUE regarding bone remodeling?

Accepted Answer

Spongy bone is replaced every 3-4 years

Question 16

A patient with low plasma calcium is likely to experience which physiological response?

Accepted Answer

Increased parathyroid hormone secretion

Question 17

Which of the following best describes the effect of mechanical stress on bone remodeling?

Accepted Answer

Increases osteoblast activity

Question 18

Which of the following is a multi-step process that involves both osteoblasts and osteoclasts?

Accepted Answer

Bone remodeling

Question 19

Which of the following is a direct effect of parathyroid hormone on the kidneys?

Accepted Answer

Stimulate activation of vitamin D and reabsorption of calcium

Question 20

Which of the following best describes the role of the 'bone bank' in calcium homeostasis?

Accepted Answer

Stores most of the body's calcium and releases it when plasma levels are low

Key Concepts in Osteology: Bone Formation, Growth, Remodeling, and Calcium Regulation

Study Guide - Practice Questions