$\frac{C_{bones}}{C_{total}} \times 100\% = 99\%$

Question 1

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

Accepted Answer

Production of hormones

Question 2

A patient is bedridden for several weeks due to injury. What is the most likely effect on their bone mass, and why?

Accepted Answer

Bone mass will decrease rapidly due to lack of mechanical stress, as up to one-third can be lost in a few weeks.

Question 3

Which bone marking is defined as a large, blunt, irregularly shaped process found only on the femur?

Accepted Answer

Trochanter

Question 4

What is the main difference between compact bone and spongy bone?

Accepted Answer

Compact bone forms the dense outer layer, providing strength and rigidity, while spongy bone consists of trabeculae and dampens sudden stresses.

Question 5

Which equation best represents the relationship between bone mass and physical activity?

Accepted Answer

$\Delta M = k \cdot S$

Question 6

A 70-year-old woman is diagnosed with osteoporosis. Which of the following best describes this condition?

Accepted Answer

A severe reduction in bone mass leading to brittle, fragile bones and compromised function.

Question 7

Which bone marking is a shallow, basin-like depression often serving as an articular surface?

Accepted Answer

Fossa

Question 8

Which part of a long bone is primarily composed of spongy bone and is located at the ends?

Accepted Answer

Epiphysis

Question 9

Which of the following statements about calcium homeostasis is correct?

Accepted Answer

Bones store 99% of the body's calcium, which is vital for physiological processes.

Question 10

Which of the following is a function of the thoracic cage?

Accepted Answer

Protects organs such as the heart and lungs, and provides attachment for muscles involved in breathing.

Question 11

A patient has a fracture at the metaphysis of a long bone. Where is this located?

Accepted Answer

The region where the diaphysis and epiphysis meet.

Question 12

Which of the following best describes the role of osteoblasts during exercise?

Accepted Answer

Osteoblasts are stimulated by weight-bearing exercise to produce bone matrix and fibers, increasing bone strength.

Question 13

Which bone marking is a round or oval opening through a bone, allowing passage of blood vessels and nerves?

Accepted Answer

Foramen

Question 14

Which of the following bones is formed by the fusion of three bones: ilium, ischium, and pubis?

Accepted Answer

Hip bone (os coxae)

Question 15

Which equation best represents the percentage of calcium stored in bones compared to total body calcium?

Accepted Answer

$\frac{C_{bones}}{C_{total}} 	imes 100\% = 99\%$

Question 16

Which of the following is true about the structure of flat bones such as the parietal bone?

Accepted Answer

They consist of spongy bone (diploë) sandwiched between two layers of compact bone.

Question 17

Which type of rib does NOT attach directly to the sternum and is known as a floating rib?

Accepted Answer

Ribs 11-12

Question 18

A patient presents with abnormal curvature of the thoracic vertebral column, resulting in a 'round back.' What is this condition called?

Accepted Answer

Kyphosis

Question 19

Which bone is a large sesamoid bone that forms within the tendon of the quadriceps femoris?

Accepted Answer

Patella

Question 20

Which of the following best explains why astronauts experience bone loss during extended periods in space?

Accepted Answer

Lack of weight-bearing activity leads to decreased stimulation of osteoblasts, causing bone mass to decrease.

Skeletal System: Structure, Function, and Classification

Study Guide - Practice Questions