Question 1

Which of the following best describes the process of endochondral ossification in long bones?

Accepted Answer

Bone replaces a pre-existing hyaline cartilage model, beginning at the primary ossification center.

Question 2

A patient presents with a fracture in the diaphysis of the femur. Which type of bone marrow is most likely found in this region, and what is its primary function?

Accepted Answer

Yellow bone marrow; fat storage

Question 3

Which equation correctly represents the relationship between bone density ($$D$$), bone mass ($$M$$), and bone volume ($$V$$)?

Accepted Answer

$$D = \frac{M}{V}$$

Question 4

Which hormone is released in response to low blood calcium levels, and what is its effect on bone tissue?

Accepted Answer

Parathyroid hormone (PTH); increases bone resorption

Question 5

A 25-year-old athlete experiences muscle soreness 48 hours after intense exercise. What is the most likely cause of this delayed onset muscle soreness (DOMS)?

Accepted Answer

Microtears in muscle fibers and subsequent inflammation

Question 6

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

Accepted Answer

Osteoclasts resorb bone by secreting acids and enzymes.

Question 7

Which of the following is a synovial joint classified as a hinge joint, and what movement does it primarily allow?

Accepted Answer

Elbow joint; flexion and extension

Question 8

A patient with osteoporosis has decreased bone mineral density. Which test is commonly used to measure this, and what is the clinical significance?

Accepted Answer

DEXA scan; quantifies bone mineral density to assess fracture risk

Question 9

Which of the following best explains why the epiphyseal plate is important during bone growth in children?

Accepted Answer

It allows for longitudinal growth of long bones until adulthood.

Question 10

Which equation best represents the calculation of cardiac output ($$CO) in $$terms of heart rate ($$HR) $$and stroke volume ($$SV$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 11

Which of the following is a correct description of the sarcomere during muscle contraction?

Accepted Answer

The I band shortens while the A band remains unchanged.

Question 12

A patient is diagnosed with muscular dystrophy. What is the underlying cause of this condition?

Accepted Answer

Genetic mutations affecting muscle proteins

Question 13

Which of the following best describes the role of ATP in muscle contraction?

Accepted Answer

ATP is required for myosin head detachment from actin after the power stroke.

Question 14

Which of the following is a correct statement about the release of calcitonin?

Accepted Answer

Calcitonin is released when blood calcium levels are high to decrease bone resorption.

Question 15

Which of the following is a real-life example of a pivot joint, and what movement does it allow?

Accepted Answer

Atlantoaxial joint; rotation of the head

Question 16

A patient with hypocalcemia is found to have elevated parathyroid hormone (PTH). Which of the following is a direct effect of PTH on the kidneys?

Accepted Answer

Increased reabsorption of calcium

Question 17

Which of the following best describes the difference between compact bone and spongy bone?

Accepted Answer

Compact bone is dense and forms the outer layer of bones, while spongy bone is porous and found at the ends of long bones.

Question 18

Which of the following is a correct statement about the function of the motor unit in skeletal muscle?

Accepted Answer

A motor unit consists of a single motor neuron and all the muscle fibers it innervates.

Question 19

Which of the following is a plausible consequence of a torn muscle?

Accepted Answer

Risk of internal bleeding and impaired muscle function

Question 20

Which of the following best explains the difference between gravitational and functional bone stresses?

Accepted Answer

Gravitational stress is due to body weight and gravity, while functional stress is caused by muscle contractions and physical activity.

Anatomy & Physiology: Skeletal and Muscular Systems Study Guide

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