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NBCRNA EXAM QUESTIONS LATEST ACTUAL EXAM 2024
NBCRNA EXAM QUESTIONS LATEST ACTUAL EXAM 2024
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NBCRNA EXAMQUESTIONS LATEST
ACTUAL EXAM 2024
:
Question 1
Which type of muscle fiber is most resistant to fatigue?
A. Type I (slow-twitch)
B. Type IIa (fast-twitch oxidative)
C. Type IIb (fast-twitch glycolytic)
D. Smooth muscle
Answer:
A. Type I (slow-twitch)
Explanation:
Type I muscle fibers, also known as slow-twitch fibers, are most resistant to fatigue. They are
adapted for endurance activities, have a high mitochondrial density, and rely heavily on aerobic
metabolism, making them efficient for prolonged, low-intensity activities.
Question 2
What is the role of calcium ions in skeletal muscle contraction?
A. To generate ATP
B. To break down acetylcholine
C. To bind to troponin and initiate cross-bridge cycling
D. To inhibit actin-myosin interaction
Answer:
C. To bind to troponin and initiate cross-bridge cycling
Explanation:
Calcium ions bind to troponin, which causes a conformational change in the troponin-
, tropomyosin complex. This exposes binding sites on actin, allowing myosin heads to form cross-
bridges, which initiates muscle contraction.
Question 3
Which structure within the muscle cell stores calcium ions that are essential for muscle
contraction?
A. Sarcoplasmic reticulum
B. Mitochondria
C. T-tubules
D. Golgi apparatus
Answer:
A. Sarcoplasmic reticulum
Explanation:
The sarcoplasmic reticulum is the specialized organelle in muscle cells that stores calcium ions.
Upon receiving an action potential, calcium is released into the cytoplasm, triggering muscle
contraction.
Question 4
Which of the following is a primary source of ATP during short bursts of intense muscle
activity, such as sprinting?
A. Aerobic glycolysis
B. Anaerobic glycolysis
C. Oxidative phosphorylation
D. Creatine phosphate
Answer:
D. Creatine phosphate
Explanation:
Creatine phosphate is the primary source of ATP for short bursts of intense activity. It quickly
donates a phosphate group to ADP to regenerate ATP, providing energy for activities lasting
about 10-15 seconds.
Question 5
Which neurotransmitter is released at the neuromuscular junction to initiate muscle
contraction?
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