Biology Support & Movement NUMS 2024
PMDC Verified Question 18 of 75
Choose the correct, for muscle in relaxed position:
A
Exposed binding sites on actin
B
Broad H-zone in sarcomere
C
Formation of cross bridges
D
\(Ca^{2+}\) released in cytosol
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Broad H-zone in sarcomere
Concept:

Sarcomere state prior to nervous stimulation.

Formula:

N/A (Conceptual)

Solution:

  • In a completely relaxed muscle, no calcium is present in the cytosol, and tropomyosin is actively blocking the actin binding sites, meaning zero cross-bridges can form.


  • Because the thin filaments have slid back out and are resting far apart from the center line, the central gap containing only thick filaments (the H-zone) is extremely wide and broad.


Why other options are incorrect:

Options A, C, and D are all definitive physiological markers of a muscle that is actively contracting, not relaxing.

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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