Question 1

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

Accepted Answer

Osteoclasts resorb bone tissue by releasing acids and enzymes, breaking down the mineral matrix.

Question 2

A patient presents with bowed legs and frequent bone fractures. Blood tests reveal low levels of Vitamin D. Which process is most directly impaired in this patient?

Accepted Answer

Calcium absorption in the intestines

Question 3

Which equation correctly represents the relationship between force, lever arm length, and torque in skeletal muscle movement?

Accepted Answer

$$T = F 	imes r$$

Question 4

During the excitation-contraction coupling in skeletal muscle, which event occurs immediately after acetylcholine (ACh) binds to receptors on the motor end plate?

Accepted Answer

An action potential is generated along the sarcolemma.

Question 5

Which type of ossification is responsible for the formation of most flat bones, such as those of the skull?

Accepted Answer

Intramembranous ossification

Question 6

A deficiency in parathyroid hormone (PTH) would most likely result in which of the following?

Accepted Answer

Decreased blood calcium levels due to reduced bone resorption

Question 7

Which of the following best explains why spongy bone is found at the ends of long bones?

Accepted Answer

Spongy bone is lighter and stores bone marrow, withstanding compressive forces.

Question 8

Which of the following is a correct description of a synovial joint?

Accepted Answer

A joint with a fluid-filled cavity, articular cartilage, and a synovial membrane, allowing free movement.

Question 9

Which of the following muscle fiber types is most resistant to fatigue and best suited for endurance activities?

Accepted Answer

Type I slow-twitch fibers

Question 10

A patient with acromegaly is likely to have which of the following hormonal imbalances?

Accepted Answer

Excess growth hormone (GH) secretion after epiphyseal closure

Question 11

Which equation best represents the calculation of ATP yield from aerobic respiration of one glucose molecule?

Accepted Answer

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

Question 12

Which structure is responsible for storing and releasing calcium ions during muscle contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 13

Which of the following best describes appositional growth in bone?

Accepted Answer

Growth in diameter by addition of new bone tissue at the surface

Question 14

Which of the following is a function of the periosteum?

Accepted Answer

It covers the outer surface of bone and contains osteoblasts for bone growth and repair.

Question 15

Which of the following best explains the difference between concentric and eccentric muscle contractions?

Accepted Answer

Concentric contractions shorten the muscle as it generates force, while eccentric contractions lengthen the muscle as it resists force.

Question 16

Which of the following is true regarding the sliding filament theory of muscle contraction?

Accepted Answer

Actin filaments slide past myosin filaments, causing the sarcomere to shorten.

Question 17

Which of the following best describes the role of Vitamin C in bone health?

Accepted Answer

Vitamin C is required for collagen synthesis in bone matrix.

Question 18

A fracture that results in the bone being broken into multiple pieces and protruding through the skin is best described as:

Accepted Answer

Comminuted, open (compound) fracture

Question 19

Which of the following best describes the function of synovial fluid in a joint?

Accepted Answer

It provides nutrients to the articular cartilage and reduces friction between joint surfaces.

Skeletal and Muscular Systems: Study Guide for Anatomy & Physiology Exam

Guida di studio - Domande di pratica

Study guide - Flashcard