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.Management Sciences
Category: Muscles and Neuromusclar Junction
Electromyography is used for________________?
A. To study muscle activity
B. Determine class II malocclusion
C. Determine the centric relation
D. Determine the centric occlusion
In myasthenia gravis_______________?
A. there is lack of acetyl choline
B. Lack of acetyl choline receptors
C. There is isometric contraction
D. Muscles are rigid and tough
Cardiac muscle contracts due to______________?
A. Extracellular Ca+2
B. Sarcoplasmic ca+2
C. Extracellular Na+
D. Intracellular Na+
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
The contractile element in a skeletal muscle is present in______________?
A. Sarcolemma
B. Sarcoplasm
C. Myofibril
D. Endomysium
In an isotonic contraction of the muscle________________?
A. The muscle moves a load through a distance
B. The muscle is not able to move the load
C. The latent period of contraction is shorter than isometric contraction
D. The length of muscle is increased
Two major types of muscle fibres are found in humans_____________?
A. white and brown
B. White and yellow
C. White and gray
D. White and red
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
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