Biology Support & Movement PMC 2020
PMDC Verified Question 65 of 75
What do we call the cell surface membrane of a muscle fiber?
A
Sarcolemma
B
Sarcoplasm
C
Plasma membrane
D
Myofibrils
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Sarcolemma
Concept:

Muscle cell nomenclature.

Formula:

N/A (Conceptual)

Solution:

  • While it is technically a specialized type of plasma membrane, biological convention uses strict specific terminology for muscle cells.


  • The distinct outer boundary and excitable cell membrane of a skeletal muscle fiber is exclusively termed the sarcolemma.


Why other options are incorrect:

Sarcoplasm is the cytoplasm inside the cell. Myofibrils are the internal contractile threads. Plasma membrane is biologically accurate but generically broad; 'sarcolemma' is the specific, correct answer.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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