hms 10 skeletal muscle SF Flashcards
1
Q
why do we need muscle
A
cardiac- pumping blood
smooth- control movement of fluids
skeletal- movement, posture, heat
2
Q
Structure of muscle cell
A
sarcolemma, sarcoplasm, sarcoplasmic reticulum, T-tubule, Triad, myofibril, sarcomere, mitochondria, thin filament, thick filament
3
Q
the motor unit
A
muscle fibre only innervated by one motor neuron
one motor neuron innervates multiple muscle fibres
4
Q
mechanism of contraction
A
excitation - neuronal action potential Ach release
contraction- Ca2+ release crossbridge formation
relaxation- Ca2+ re-uptake uncoupling crossbridge
