Q: Which equation best represents the relationship between calcium homeostasis and bone remodeling?

$$ \text{Bone Mass} = \text{Osteoblast Activity} - \text{Osteoclast Activity} $$

Question 1

Which of the following best describes the function of the periosteum in bone?

Accepted Answer

It covers the external surface of bone, provides attachment for tendons and ligaments, and contains osteogenic cells for bone growth and repair.

Question 2

A patient presents with bowed legs and delayed growth. Laboratory tests reveal low vitamin D levels. Which bone disorder is most likely present, and what is the underlying cause?

Accepted Answer

Rickets; defective mineralization of growing bones caused by vitamin D deficiency.

Question 3

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

Accepted Answer

Production of hormones

Question 4

Which cell type is primarily responsible for bone resorption, and what enzyme does it use to dissolve bone matrix?

Accepted Answer

Osteoclast; acid phosphatase

Question 5

Which structural feature of compact bone allows blood vessels and nerves to travel longitudinally through the bone?

Accepted Answer

Central (Haversian) canal

Question 6

A bone fracture is classified as 'open' when:

Accepted Answer

The bone breaks and protrudes through the skin.

Question 7

Which hormone increases blood calcium levels by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 8

During endochondral ossification, which sequence correctly describes the order of events?

Accepted Answer

Formation of bone collar, invasion of blood vessels, development of primary ossification center, formation of medullary cavity, secondary ossification center formation

Question 9

According to Wolff’s Law, which scenario best illustrates the principle?

Accepted Answer

A tennis player’s dominant arm shows increased bone density compared to the non-dominant arm.

Question 10

Which equation best represents the relationship between calcium homeostasis and bone remodeling?

Accepted Answer

$$ 	ext{Bone Mass} = 	ext{Osteoblast Activity} - 	ext{Osteoclast Activity} $$

Question 11

Which of the following best describes the difference between interstitial and appositional bone growth?

Accepted Answer

Interstitial growth increases bone length, while appositional growth increases bone thickness.

Question 12

Which component of bone provides tensile strength and flexibility?

Accepted Answer

Collagen fibers

Question 13

A child with a mutation affecting the epiphyseal plate would most likely experience which of the following?

Accepted Answer

Impaired bone lengthening due to disrupted cartilage growth.

Question 14

Which of the following is a correct sequence for the four steps of fracture repair?

Accepted Answer

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

Question 15

Which of the following best describes the function of Sharpey’s fibers?

Accepted Answer

They anchor the periosteum to the underlying bone.

Question 16

Which type of skeletal cartilage is found at the ends of long bones and reduces friction in joints?

Accepted Answer

Hyaline cartilage

Question 17

Which bone cell type is most active during the formation of the bony callus in fracture repair?

Accepted Answer

Osteoblast

Question 18

Which risk factor is most strongly associated with osteoporosis?

Accepted Answer

Advanced age and decreased estrogen levels

Question 19

Which structural element is unique to spongy bone and provides support while reducing bone weight?

Accepted Answer

Trabeculae

Question 20

Which equation best represents the process of bone mineralization?

Accepted Answer

$$ 	ext{Ca}^{2+} + 	ext{PO}_4$$^{3-}$$ ightarrow 	ext{Ca}_{10}(	ext{PO}_4)_6(	ext{OH})_2 $$

Chapter 6 Skeletal System Study Guide – Step-by-Step Guidance

Study Guide - Practice Questions

Study Guide - Flashcards