Page 84 - Teknik Menjawab Soalan PSPM Biologi

Describe the events that occur when a resting skeletal muscle is stimulated by a motor

neuron

At Muscle

● Myosin head binds with actin to form

cross bridge

● Phosphate is released from myosin head

● Myosin head bends 45 0

● As it bend, thin filament is pulled towards the

middle part of sarcomere (power stroke)

● ADP is released

● A new ATP molecules attaches to the myosin

head causes cross bridges detach

● If sufficient Ca 2+ are present, power stroke

repeats

● During contraction, thin filaments slide past

the thick filaments

● Which causes the skeletal muscle cell to

shortens