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Biol 223

QuestionAnswer
What would happen if you have lack of acid flow cholinesterase in synaptic cleft? More actin potential will occur
Actin and Myosin Actin and myosin filiments do not change in length during contraction of skeletal muscle, but the slide past one another, causing the sarcomeres to shorten.
Sarcomeres Shorten during muscle contraction and lengthen during relaxation.
Repolarization Occurs when Na+ channels close and k+ channels open. This allows k+ to move out of the cell past polarized phase hyperpolarization.
Depolarization Depolarization is caused by decrease in the charge difference or polarity across the plasme membrane.
What results if acetylcholine binds to a membrane bound receptor? Depolarization
What does the use of a drug blocking acetylcholine receptors result in? Less action potential-because they degrade enzyme in synaptic cleft.
Passageway for calcium from the sarcolemma? Voltage gated calcium channels in presynaptic membrace
Role of calcium during muscle contraction? Calcium causes the synaptic vesicles to open and release ache
How does relaxation occur? Relaxation occurs as a result of the transport of calcium back into the sarcoplasmic reticulum.
Interference of the transport of calcium ions back into the sarcoplasmic reticulum results in? Muscle contraction?
What is an ATP molecule required for? It is needed for muscles to contract as well as for muscle fibers to relax.
Where do calcium ions go after muscle contraction occurs? Calcium ions are transported back into the sarcoplasmic reticulum for muscle relaxation.
Depolarize less negativity inside the plasma membrane
Repolarize return of resting membrane potential
Hyperpolarize increase of the charge difference across the plasma membrane
Troponin Troponin is composed of three subunits: one that binds actin second that binds to tropomyosin and the third that has a binding site for calcium.
Created by: Stephanie3221
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