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【单选题】
元素周期律的提出是化学发展史上的一个里程碑,提出元素周期律的科学家是()。A.
卢瑟福
B.
波义尔
C.
D.
道尔顿
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皮皮学刷刷变学霸
举一反三
【单选题】Which one is correct about the AP conduction velocity of nerve fiber
A.
Increase of the temperature within physiological limit will increase the conduction velocity.
B.
The fiber with big diameter always conduct faster.
C.
The increase of extracellular K+ will increse the conduction velocity
D.
Myelination of nerve fiber always decreases the conduciton velocity.
E.
Anesthesia do not influence the conduction velocity.
【简答题】女子月经期的体育卫生要求
【单选题】Which one is correct about the AP conduction velocity of nerve fiber
A.
The fiber with big diameter always conduct faster.
B.
The increase of extracellular K+ will increse the conduction velocity
C.
Myelination of nerve fiber always decreases the conduciton velocity.
D.
Increase of the temperature within physiological limit will increase the conduction velocity.
E.
Anesthesia do not influence the conduction velocity.
【多选题】The factors that influence the AP conduction velocity on nerve fiber include
A.
thickness of the myelin shealth.
B.
myelinated or not
C.
diameter of the fiber
D.
temperature
E.
strength of the stimulation
【简答题】简述女子月经期的体育卫生要求。
【单选题】In the sciatic nerve - sartorius experiments, the fatigue of muscle contraction after successive stimulation of nerve fiber is caused by
A.
the inhibition of the signal transmission at neuro-muscle junction.
B.
the decrease of the action potential amplitude.
C.
the decreae of the speed action potential propagates on the nerve fiber.
D.
the low excitability of the muscle.
E.
the decreased efficiency of the signal transmission at triad of the sarcolemma.
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