A single muscle cell is called a
muscle fiber
fascicle
myofibril.
Myofilament
The Correct Answer is A
Rationale:
A. Muscle fiber is the correct term for a single muscle cell. It is multinucleated and contains many myofibrils.
B. Fascicle is a bundle of muscle fibers surrounded by connective tissue (perimysium), not a single cell.
C. Myofibril is a subcellular structure within a muscle fiber made up of repeating sarcomeres; many myofibrils make up one muscle fiber.
D. Myofilament refers to the protein filaments (actin and myosin) within myofibrils that are responsible for contraction, not the entire cell.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Rationale:
A. Smooth muscle (found in organs and vessels) and cardiac muscle (in the heart) function involuntarily under the autonomic nervous system. Skeletal muscle, on the other hand, is under voluntary control through the somatic nervous system.
B. This would be incorrect because skeletal muscle is not involuntary, and smooth/cardiac muscles are not voluntary.
Correct Answer is D
Explanation
Rationale:
A. 750 mL is higher than the normal daily loss through insensible perspiration and would typically only occur with conditions like fever or very hot environments.
B. 250 mL is too low; the body normally loses more than this each day through skin and respiratory evaporation.
C. 650 mL is close but still above the usual average range for a healthy adult at rest.
D. 500 mL is the approximate average fluid lost daily through insensible perspiration (skin and lungs), making this the correct answer.
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