Biology Support & Movement DUHS 2022
PMDC Verified Question 58 of 75
Each myosin is surrounded by:
A
Motor nerves
B
Myosin head
C
6-actin filaments
D
2-actin filaments
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 6-actin filaments
Concept:

Geometric lattice arrangement of myofilaments in skeletal muscle.

Formula:

N/A (Conceptual)

Solution:

  • When viewed in cross-section within the zone of overlap, the myofibril displays a highly ordered, precise hexagonal lattice.


  • In this lattice, each thick myosin filament is symmetrically surrounded by exactly six thin actin filaments, maximizing cross-bridge binding opportunities.


Why other options are incorrect:

While a thin actin filament is surrounded by 3 myosin filaments, the reverse (myosin surrounded by actin) is always a 6-to-1 hexagonal ratio.

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