1. Base on the sliding filament model of muscle contraction. How does muscle contract?Include the role of calcium, troponin, and tropomyosin. The interaction between actin and myosin; and each step of the cross bridge cycle.
2. Describe the components of the neuromuscular junction and the process by which signal from brain or spinal cord translate into the release of neurotransmitter.

a. The role of presynaptic calcium and indicate what causes it to enter the axon terminal.

b. What is motor end plate? What is end plate potential

c. What neurotransmitter is released and what influences how long it acts at the synapse?what type of channel binds differ from the ones that are part of muscles

action potentials?

3. Ways in which an entire muscles may contract with greater force? That is, what we do when we need to lift a heavier load? How do we do that?

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