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.Management Sciences
Category: Muscles and Neuromusclar Junction
Succinyl choline acts to block neuromuscular transmission by_______________?
A. Inhibiting cholinesterase
B. Inhibiting the CNS
C. Depolarizing the motor end plate of skeletal muscle
D. Blocking the release of acetyl choline at the end plate
Rigor mortis results after death is due to________________?
A. Failure of acetylcholine to diffuse
B. Failure of ATP supply
C. Failure of break down of calcium bridges
D. None of the above
Skeletal muscles_____________?
A. Contracts when calcium is taken up by sarcoplasmic reticulum
B. Contracts when actin and myosin filaments shorten
C. Contraction is initiated by calcium binding to troponin
D. Contraction is initiated by calcium binding to tropomyosin
All are features of skeletal muscle except______________?
A. Cylindrical
B. Transverse striation
C. Centrally placed nuclei
D. Multiple nuclei
Which is caused by acetylcholine through nicotinic receptors_____________?
A. Contraction of skeletal muscle
B. Decrease of heart rate
C. Secretion of saliva
D. Contraction of pupils
The neuromuscular transmitter released at neuromuscular junction is_______________?
A. Dopamine
B. Epinephrine
C. Nor epinephrine
D. Acetylcholine
Upstroke of action potential would lead to________________?
A. Net current in an outward direction
B. Cell interior becomes more negative
C. Cell interior becomes less negative
D. None of the above
The following electrodes are used to detect the muscle activity without pain_________________?
A. Surface electrode
B. Round electrode
C. Hook electrode
D. Needle electrode
Small packets of acetylcholine released randomly from the nerve cell membrane at rest Produces_______________?
A. Inhibitory post synaptic potential
B. Miniature end plate potential
C. Action potential
D. End plate potential
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