Asked by Kunal Kamerkar on May 11, 2024
Verified
What is the power stroke?
A) A protein found along the groove of the F-actin double helix
B) A T tubule and two adjacent terminal cisternae
C) The combination of myosin heads with active sites on actin molecules
D) The movement of myosin head while attached to actin myofilament
E) After exercise, the O2 taken in that exceeds the O2 required for resting metabolism
Power Stroke
The phase in muscle contraction where the head of the myosin molecule pivots, pulling the actin filament inward and shortening the muscle fiber.
Myosin Head
Part of the myosin protein that binds to actin filaments in muscle cells, playing a critical role in muscle contraction.
Actin Myofilament
A thin filament primarily made of the protein actin, playing a crucial role in muscle contraction and cell movement.
- Gain insight into the organization and function of muscular components such as the triad and myofilaments.
Verified Answer
WD
william djohanMay 15, 2024
Final Answer :
D
Explanation :
The power stroke refers to the movement of the myosin head while it is attached to the actin myofilament, which is a crucial step in muscle contraction.
Learning Objectives
- Gain insight into the organization and function of muscular components such as the triad and myofilaments.