KIVO Med
Physiology of striated skeletal muscle contraction
From muscle and sarcomere organization to excitation–contraction coupling and the actin–myosin cross-bridge cycle.
- 40 explained questions
- 36 flashcards
- 116 estimated course minutes
Updated
What you will learn
- Describe the connective-tissue layers, muscle fibre, motor unit, and sarcomere architecture.
- Explain neuromuscular transmission, the triad, and calcium's role in excitation–contraction coupling.
- Connect contractile proteins to filament sliding and explain rigor mortis.
Course outline
Why striated skeletal muscle is essential for movement
The big picture: neural coordination, muscle types, functions, and somatic motor control.
8 min
From the muscle covering to the fibre
Connective-tissue layers organize fascicles and transmit force to the tendon.
9 min
Fibre, motor unit, and the first view of a sarcomere
The muscle cell, its innervation, and the origin of the striated appearance.
11 min
Sarcomere architecture
Z striations, I and A bands, H and M zones, and parallel filament organization.
10 min
The thick filament: an ATP-powered machine
Myosin organization and the mobility of its heads.
9 min
The thin filament: actin, tropomyosin, and troponin
The three proteins that control access of myosin heads to actin.
10 min
Titin and structural proteins
Elastic and anchoring proteins preserve myofibril alignment.
10 min
Sarcoplasmic reticulum and the triad
The system that stores calcium and carries the action potential into the fibre.
9 min
From the alpha motor neuron to the muscle action potential
The neuromuscular junction turns the nerve impulse into an electrical signal in the fibre.
9 min
Excitation–contraction coupling: the role of calcium
The MAP, triad, DHPR, RYR, and SERCA connect electricity to shortening.
12 min
Filament sliding and the cross-bridge cycle
Huxley's theory explains how calcium and ATP make actin slide on myosin.
11 min
Rigor mortis and synthesis
When ATP disappears after death, cross-bridges remain attached; the course ends with an integrated view.
8 min
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