Question 1

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

Accepted Answer

Osteoclasts break down bone tissue, releasing calcium into the bloodstream.

Question 2

A patient presents with osteoporosis. Which hormone is most likely decreased, leading to increased bone resorption?

Accepted Answer

Calcitonin

Question 3

During the process of endochondral ossification, which structure is responsible for the lengthwise growth of long bones in children?

Accepted Answer

Epiphyseal plate

Question 4

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

Accepted Answer

Regulation of body temperature

Question 5

A fracture is classified as 'comminuted' if:

Accepted Answer

The bone is broken into three or more fragments.

Question 6

Which equation correctly represents the relationship between calcium homeostasis and parathyroid hormone (PTH) action?

Accepted Answer

$\mathrm{PTH} \uparrow \Rightarrow \mathrm{Ca^{2+}} \uparrow$

Question 7

Which of the following bones is part of the axial skeleton?

Accepted Answer

Sternum

Question 8

A patient suffers a fracture in the shaft of the humerus. Which stage of fracture repair involves the formation of a fibrocartilaginous callus?

Accepted Answer

Second stage

Question 9

Which type of synovial joint allows movement in multiple axes and planes, such as the shoulder joint?

Accepted Answer

Ball-and-socket joint

Question 10

Which muscle group is responsible for extending the knee?

Accepted Answer

Quadriceps

Question 11

During muscle contraction, which event occurs first at the neuromuscular junction?

Accepted Answer

Influx of calcium ions into the axon terminal

Question 12

Which equation best represents the ATP yield from aerobic respiration in muscle cells?

Accepted Answer

$\mathrm{C_6H_{12}O_6} + 6\mathrm{O_2} \rightarrow 6\mathrm{CO_2} + 6\mathrm{H_2O} + 36\mathrm{ATP}$

Question 13

Which of the following best describes the difference between isometric and isotonic muscle contractions?

Accepted Answer

Isometric contractions generate tension without changing muscle length, isotonic contractions change muscle length.

Question 14

A patient with myasthenia gravis is likely to experience which of the following symptoms?

Accepted Answer

Progressive muscle weakness due to impaired acetylcholine receptors

Question 15

Which connective tissue structure surrounds an individual muscle fiber?

Accepted Answer

Endomysium

Question 16

Which of the following is a synarthrosis joint?

Accepted Answer

Suture between skull bones

Question 17

Which muscle property allows it to return to its original length after being stretched?

Accepted Answer

Elasticity

Question 18

Which of the following best describes the sliding filament theory of muscle contraction?

Accepted Answer

Actin filaments slide past myosin filaments, shortening the sarcomere.

Question 19

Which body movement is defined as decreasing the angle between two bones at a joint?

Accepted Answer

Flexion

Skeletal and Muscular Systems: Study Guide for Anatomy & Physiology

Study Guide - Practice Questions