Please help my with physiology. Thank you very much. Which of the following is T
ID: 3512678 • Letter: P
Question
Please help my with physiology. Thank you very much.
Which of the following is TRUE of skeletal muscle fiber contraction?
A. cross-bridge cycle only occurs during isotonic contractions
B. cytosolic Ca2+ changes at the same rate as electrical depolarization and repolarization
C. myosin releases actin after the power stroke in the absence of other chemical signals
D. during a twitch, myosin remains attached to actin even after sarcolemma repolarization
A cholinesterase inhibitor will _____________.
increase contraction of smooth muscle of the digestive system and speed the heart rate
increase contraction of both skeletal muscle and smooth muscle of the digestive system
increase contraction of skeletal muscle and speed the heart rate
decrease contraction of skeletal
A.increase contraction of smooth muscle of the digestive system and speed the heart rate
B.increase contraction of both skeletal muscle and smooth muscle of the digestive system
C.increase contraction of skeletal muscle and speed the heart rate
D.decrease contraction of skeletal
Explanation / Answer
1st question Answer
D. during a twitch, myosin remains attached to actin even after sarcolemma repolarization
other are false
2nd question Answer:
A cholinesterase inhibitor will _____________.
Answer: Increase contraction of both skeletal muscle and smooth muscle of the digestive system
Note: Acetylcholine is the neurotransmitter that passes between motor neurons and muscles at the neuromuscular junction. Thus, acetylcholine is needed to initiate muscle contraction. Usually, acetylcholine is rapidly broken down. However, in the presence of the AChE (acetylcholinesterase) inhibitor, the muscle would receive a longer signal from the motor neuron, increasing the duration of the contraction. Following function takes place due to this presence of AChE.
heart - bradycardia (slow beating)
bladder - urine retention
GI tract - hypermotility
sweat glands - hypersecretion
skeletal muscle - go on contracting
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