Some lingering AP (animal phys) regarding the muscles and the circulatory system
ID: 208598 • Letter: S
Question
Some lingering AP (animal phys) regarding the muscles and the circulatory system
1) Which myofilament (actin or myosin) is associated with regulatory proteins? Which myofilament (actin or myosin) has an ATP binding site?
2) Explain in detail how the action potential spreads from the initial site of sarcolemma depolarization to the sarcoplasmic reticulum.
3)What is the source of calcium ions for muscle contraction?
4)Explain the sliding filament mechanism of muscle contraction. What are the roles of ATP binding and ATP hydrolysis in this mechanism?
5)Describe 3 factors that can affect the force of muscle contraction, and explain the underlying physiological mechanisms.
6)Describe 3 factors that can affect the force of muscle contraction, and explain the underlying physiological mechanisms.
7)Describe the three mechanisms a muscle can use to generate ATP, including:
a.How fast is each mechanism?
b.How long can each mechanism be useful?
c.What are the advantages and disadvantages of each?
d.What fuels can be used for anaerobic and aerobic metabolism?
e.Under what circumstances would one mechanism be used more than the others?
8)How is it that pacemaker cells in a myogenic heart can generate action potentials without stimulation from the nervous system? Describe this mechanism. (Your answer should include the following terms: pacemaker potentials, unstable resting membrane potential, and nonselective cation "funny" channels.)
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Explanation / Answer
Regulatory protiens are arranged into regular strands that would appeare like sarcomere. Sarcomere are divided into many units and bands. Mysoin is the most abundant myofilament found in regulatory protiens. Actin is found in association with ATP binding site.
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