Q: Which equation best represents the ATP hydrolysis reaction that powers the myosin head during muscle contraction?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy}$$

Question 1

Which layer of the epidermis is only present in thick skin, such as the palms of the hands and soles of the feet?

Accepted Answer

Stratum lucidum

Question 2

A patient suffers a third-degree burn covering the anterior surface of both legs and the anterior trunk. Using the rule of nines, what percentage of the body surface is affected?

Accepted Answer

36%

Question 3

Which cell type in the epidermis is primarily responsible for producing the pigment that protects against UV radiation?

Accepted Answer

Melanocyte

Question 4

During endochondral ossification, which event occurs first?

Accepted Answer

Bone collar formation around the diaphysis

Question 5

Which bone cell is responsible for breaking down bone tissue during remodeling?

Accepted Answer

Osteoclast

Question 6

Which of the following is an example of a synovial joint classified as a ball-and-socket joint?

Accepted Answer

Hip

Question 7

Which structural feature distinguishes a synovial joint from other joint types?

Accepted Answer

Presence of a joint cavity filled with synovial fluid

Question 8

Which movement describes decreasing the angle between two bones, such as bending the elbow?

Accepted Answer

Flexion

Question 9

Which muscle type is involuntary and found in the walls of hollow organs?

Accepted Answer

Smooth muscle

Question 10

During muscle contraction, which band in the sarcomere remains unchanged in length?

Accepted Answer

A band

Question 11

Which component of the muscle fiber stores calcium ions necessary for muscle contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 12

A marathon runner is likely to have a higher proportion of which type of skeletal muscle fiber?

Accepted Answer

Slow oxidative

Question 13

Which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 14

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

Accepted Answer

Actin filaments slide past myosin filaments, shortening the sarcomere

Question 15

Which equation best represents the ATP hydrolysis reaction that powers the myosin head during muscle contraction?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 16

Which of the following is a feature unique to cardiac muscle compared to skeletal muscle?

Accepted Answer

Presence of intercalated discs

Question 17

Which joint movement occurs when you move your arm away from the midline of your body?

Accepted Answer

Abduction

Question 18

Which structure is responsible for transmitting the action potential deep into the muscle fiber?

Accepted Answer

T tubule

Question 19

Which of the following best describes the effect of aging on skeletal muscle?

Accepted Answer

Decrease in muscle mass and strength

Question 20

Which of the following is a correct sequence of organization from smallest to largest in muscle structure?

Accepted Answer

Myofibril → muscle fiber → fascicle → muscle

Study Guide: Integumentary, Skeletal, Joints, and Muscular Systems

Study Guide - Practice Questions

Study Guide - Flashcards