6215178
Description
Quiz by Nada Medhat, updated more than 1 year ago
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Created by Nada Medhat
over 7 years ago
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Question 1
Question
1) Characters of Local potential:
Answer
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A) Cannot be graded.
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B) Followed by ARP
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C) Associated with decremental conduction.
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D) Cannot be summated.
Question 2
Question
2) Alactic oxygen debt:
Answer
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A) Uses greater amount of O2
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B) Used to replenish ATP stores
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C) Takes 1 hour or more
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D) All of the above
Question 3
Question
3) Moderate training, long duration swimming:
Answer
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A) Increase number of capillaries.
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B) Increase myoglobin.
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C) Increase number of mitochondria.
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D) All of the above.
Question 4
Question
4) Isotonic Contraction:
Answer
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A) Tension is constant.
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B) Muscle length decreases.
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C) Mechanical efficiency is Zero.
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D) A + B.
Question 5
Question
5) Smooth muscle Contraction:
Answer
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A) Needs Calmodulin.
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B) Has Low ATPase activity
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C) At first, Tension increases then decreases.
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D) All of the above.
Question 6
Question
6) Nerve Excitability is increased by:
Answer
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A) Hyperkalemia
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B) Hypercalcemia
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C) Hyponatremia
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D) A + C.
Question 7
Question
7) During rest, Voltage gated Na channels:
Answer
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A) m gate close, h gate close.
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B) m gate close, h gate open
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C) m gate open, h gate open
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D) n gate open.
Question 8
Question
8) Skeletal muscle contraction:
Answer
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A) Ca binds to Troponin T
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B) Bending of Cross bridges donot need ATP.
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C) A band shortens
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D) Ca release from SR.
Question 9
Question
9) Smooth muscle contraction is enhanced by:
Answer
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A) Acetyl choline
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B) Progesterone
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C) Norepinephrine
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D) A + B
Question 10
Question
7) All are characteristics of single unit smooth muscle except:
Answer
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A) Unstable RMP.
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B) Spontaneous electric activity
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C) Nonrhythmic
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D) Obey all or None law
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