Free CSCS: Structure & Function of Body System Questions and Answers — Questions and Answers

Question 1: Muscle fibers of type IIa are...

Red / White (Correct answer)
Red / White
White

Correct answer: Red / White

Explanation: White and red. Since Type I muscle fibers have a greater capacity for aerobic energy supply, they are "slow-twitch" and have a higher resilience to fatigue. Due to a more robust anaerobic energy source, type IIa muscle fibers are "fast-twitch," have a better capability for generating force quickly, and have lesser resistance to fatigue. Muscle fibers of Type IIx are "fast twitch," more capable of producing power quickly, and less resistant to exhaustion than Type IIa fibers.

Question 2: The ankle is a multiaxial joint, correct or incorrect.

FALSE (Correct answer)
TRUE

Correct answer: FALSE

The statement is FALSE because the ankle (talocrural joint) is a uniaxial hinge joint, primarily allowing dorsiflexion and plantarflexion in one plane. A multiaxial joint, like the ball-and-socket hip, moves freely in all three planes, which the ankle does not.

Question 3: An electrocardiogram (ECG) measurement by the machine shows heart ventricular repolarization.

T-Wave (Correct answer)
P-Wave
QRS Complex

Correct answer: T-Wave

Explanation: T-Wave. Ventricular repolarization is correlated with the T-Wave.

Question 4: True or False: Skeletal muscle is connected to myofilament, a fibrous connective tissue.

TRUE
FALSE (Correct answer)

Correct answer: FALSE

Explanation: The fibrous connective tissue layers that are involved with skeletal muscle are the epimysium, perimysium, and endomysium. Myofilaments (actin and myosin) are the contractile apparatus contained within myofibrils (which are contained within muscle fibers).

Question 5: If the blood's oxygen partial pressure is low and the alveoli's partial pressure of oxygen is high. As oxygen moves,

From the area of high partial pressure to the area of low partial pressure (Correct answer)
From the area of low partial pressure to the area of high partial pressure

Correct answer: From the area of high partial pressure to the area of low partial pressure

Explanation: From a high partial pressure region to a low partial pressure region. Moving from a high concentration area to a low concentration area, oxygen will follow the gradient in concentration.

Question 6: What are the two major myofilament kinds can be discovered inside a myofibril?

Actin, Titin
Myosin, Titin
Actin, Myosin (Correct answer)

Correct answer: Actin, Myosin

Explanation: Myosin and Actin. The mechanism used to contract the muscle cell is found within myofibrils. Actin and myosin, two different forms of myofilaments, comprise most of this apparatus.

Question 7: What is the name of a muscle cell's membrane?

Sarcolemma (Correct answer)
Epimysium
Sarcoplasmic Reticulum
Transverse Tubule

Correct answer: Sarcolemma

The sarcolemma is the specialized plasma membrane of a muscle cell, using the muscle-specific prefix 'sarco-.' The epimysium is connective tissue around a whole muscle, the sarcoplasmic reticulum stores calcium inside the cell, and the transverse (T) tubule carries impulses inward—none are the cell membrane itself.

Free CSCS: Structure & Function of Body System Questions and Answers

Muscle fibers of type IIa are...