In a laboratory experiment, adding curare, which binds to acetylcholine receptors, to the solution around a...
In a laboratory experiment, adding curare, which binds to acetylcholine receptors, to the solution around a muscle decreases the size of the end-plate potential. Adding prostigmine, an acetylcholinesterase blocker, increases the size of the end-plate potential. Explain why.
Homework Answers
End-plate potential is responsible for causing depolarization of the skeletal muscles fibers when acetylcholine bind to the postsynaptic membrane in the neuromuscular junction. Binding of curare which is the competitive inhibitor of neurotransmitters (acetylcholine) , inhibit the activity of acetylcholine and therefore decreases the size of end-plate potential. Adding prostigmine increases the size of end-plate potential because it inhibit the activity of acetylcholinesterse enzyme that break acetylcholine into choline esters.
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In a laboratory experiment, adding curare, which binds to
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#3
of to as to of In Panel A the muscle is passively beched by adding a load at the arrow marked "PULL". Why does the latest Sher from the degan increase its action potential discharge when the food is added stimulating ONLY the mo o n and the caused the muscle to short What causes the latteren for decrease discharge when t he motoneuronne mulated? c. In Panel of the arrow labeled on the muscles are contracted by simulating...
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2. Curare blocks acetylcholine receptors at the motor end plate. This would result in: (1) Inability of the muscle fiber to respond to nervous stimulation (2) Increased muscle stimulation (3) Increased actylcholinesterase production (4) Lack of calcium uptake by the muscle fiber 3. The structure that is analogous to the Zline of skeletal muscle is the __ of smooth muscle. The structure that is analogous to troponin of skeletal muscle is _ muscle is ___ of smooth muscle. 4. Draw...
Choc Muscle fiber nucleus Myofibrilot muscle fiber Figure 10.15. Details of the neuromuscular junction. Label the structures labeled with capital letters. The numbers 1-4 indicate the chain of events that occur at the neuromuscular junction. Put these events in chronological order by placing a l in the blank before the first event, etc. Refer back to Figure 10.15 for information. Acetylcholine diffuses across the synaptic cleft. Nerve impulse reaches the axon terminal. Synaptic vesicles release acetylcholine into the synaptic cleft....
#3
of to as to of In Panel A the muscle is passively beched by adding a load at the arrow marked "PULL". Why does the latest Sher from the degan increase its action potential discharge when the food is added stimulating ONLY the mo o n and the caused the muscle to short What causes the latteren for decrease discharge when t he motoneuronne mulated? c. In Panel of the arrow labeled on the muscles are contracted by simulating...
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change pas channels in the volta t ive protein to change shape. This A of the S l e terminal siste oplasmic reticum calcio p r eneule warcoplasm reticulum sodium ions m o nster transverse tubules sarcolemma: calcium ions Saroplasmic reticum: triadsarcolemma: calcium ions sons bind to This causes a change in shape and exposing C D E Calcium vesicle tylcholine action potential Sodium sarcolemma calcium on myosin heads Sodium sacoplasmic reticulum calcium ions actin 15. An attaches to exposed...
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