Biology Support & Movement ETEA 2022
PMDC Verified Question 57 of 75
The hollow elongated tube formed when muscle fiber penetrates deep into the cell is known as:
A
A-tubule
B
M-tubule
C
T-tubule
D
Z-tubule
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: T-tubule
Concept:

Excitation-contraction coupling anatomy.

Formula:

N/A (Conceptual)

Solution:

  • For a muscle to contract simultaneously throughout its entire thickness, the nerve impulse must be delivered deep inside the cell instantly.


  • This is achieved by inward invaginations of the sarcolemma that plunge deep into the interior sarcoplasm. These transverse structures are called T-tubules (Transverse tubules).


Why other options are incorrect:

A, M, and Z refer to specific protein bands and lines within the sarcomere structure, not hollow membrane invaginations.

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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