Biology Support & Movement MDCAT 2016
PMDC Verified Question 72 of 75
Each muscle fiber is surrounded by a modified cell membrane called:
A
Sarcolemma
B
Myosin Filament
C
Sarcomere
D
Myofilament
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:

Anatomy of a muscle cell.

Formula:

N/A (Conceptual)

Solution:

  • A muscle fiber is a single muscle cell.


  • Its highly specialized outer plasma membrane, which is uniquely capable of conducting action potentials deep into the cell via T-tubules, is called the sarcolemma.


Why other options are incorrect:

Myofilaments (actin/myosin) and sarcomeres are internal contractile structures. They are surrounded by the sarcoplasm and eventually bounded by the sarcolemma.

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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