chpt 9 review 9.4-9.6

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describe the neuromuscular junction

NMJ is intercellular connection that enable motor neuron to communicate with skeletal muscle fiber
how would a drug that blocks acetylcholine release affect muscle contraction

a muscle contraction would not occur
predict what would happen if there were no AChE in the synaptic cleft

the muscle would be locked in a contraction state
what molecule supplies the energy for a muscle contraction

ATP
list the interrelated steps that occur once the contraction cycle has begun

active-site exposure, cross-bridge formation, myosin head pivoting (power stroke), cross-bridge detachment, myosin reactivation "recocking'
what triggers myosin reactivation

the breakdown of ATP to ADP+P
name a factor that affects the amount of tension produced when a skeletal muscle contracts

the length of individual sarcomere
explain two key concepts of the length-tension relationship

the greater the zone of overlap in sarcomere the greater the tension the muscle can develop, there is an optimum range of actin and myosin overlap that will produce the greatest amount of tension
for each portion of a myogram tracing a twitch in a stimulated gastrocnmeius muscle fiber, describe the events that occur within the muscle

first the latent period than contraction phase and finally relaxation phase