当细胞外钾离子被去除 对钠钾泵的影响?A.It caused the pump to accelerate due to the larger outwardly directedpotassium gradient.B.It had little effect on the pump which is primarily responsible for extrudingsodium.C.It caused the pump
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当细胞外钾离子被去除 对钠钾泵的影响?A.It caused the pump to accelerate due to the larger outwardly directedpotassium gradient.B.It had little effect on the pump which is primarily responsible for extrudingsodium.C.It caused the pump
当细胞外钾离子被去除 对钠钾泵的影响?
A.It caused the pump to accelerate due to the larger outwardly directed
potassium gradient.
B.It had little effect on the pump which is primarily responsible for extruding
sodium.
C.It caused the pump to shuttle sodium across the membrane equally in both
directions.
D.It caused the pump to reverse direction,loading the cell with sodium and
producing ATP.
E.It caused the cell to depolarize which in turn accelerated the pump since it is
electrogenic.
当细胞外钾离子被去除 对钠钾泵的影响?A.It caused the pump to accelerate due to the larger outwardly directedpotassium gradient.B.It had little effect on the pump which is primarily responsible for extrudingsodium.C.It caused the pump
静息电位产生的基本原因是离子的跨膜扩散,和钠- 钾泵的特点也有关系.细胞膜内K+浓度高于细胞外.安静状态下膜对K+通透性大, K+顺浓度差向膜外扩散,膜内的蛋白质负离子不能通过膜而被阻止在膜内,结果引起膜外正电荷增多,电位变正；膜内负电荷相对增多,电位变负,产生膜内外电位差.这个电位差阻止K+进一步外流,当促使K+外流浓度差和阻止K+外流的电位差这两种相互对抗的力量相等时,K+外流停止.膜内外电位差便维持在一个稳定的状态,即静息电位.(静息电位钾离子外流大于钠离子内流）
当外膜钾离子浓度降低时,外面的正电荷也降低, 动作电位上升支——Na+内流所致.
动作电位的幅度决定于细胞内外的Na+浓度差,细胞外液Na+浓度降低动作电位幅度也相应降低.
静息电位产生的基本原因是离子的跨膜扩散，和钠- 钾泵的特点也有关系。细胞膜内K+浓度高于细胞外。安静状态下膜对K+通透性大， K+顺浓度差向膜外扩散，膜内的蛋白质负离子不能通过膜而被阻止在膜内，结果引起膜外正电荷增多，电位变正；膜内负电荷相对增多，电位变负，产生膜内外电位差。这个电位差阻止K+...
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静息电位产生的基本原因是离子的跨膜扩散，和钠- 钾泵的特点也有关系。细胞膜内K+浓度高于细胞外。安静状态下膜对K+通透性大， K+顺浓度差向膜外扩散，膜内的蛋白质负离子不能通过膜而被阻止在膜内，结果引起膜外正电荷增多，电位变正；膜内负电荷相对增多，电位变负，产生膜内外电位差。这个电位差阻止K+
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