Biology Support & Movement AJK 2019
PMDC Verified Question 66 of 75
Each muscle fiber contains long threads that extend along its entire length. These are called as:
A
Myosin
B
Microtubules
C
Microfilaments
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 D: Myofibrils
Concept:

Hierarchical organization of skeletal muscle.

Formula:

N/A (Conceptual)

Solution:

  • Inside the sarcolemma of a single muscle fiber, the cytoplasm is packed with parallel, rod-like contractile threads extending the entire length of the cell.


  • These macroscopic longitudinal bundles of interacting protein filaments are called myofibrils.


Why other options are incorrect:

Myosin and microfilaments (actin) are the smaller, individual molecular proteins that physically make up the larger myofibril structure.

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