![](https://lstatic.shangxueba.com/jiandati/pc/images/pc_jdt_tittleico.png)
In which phase of the ventricular muscle action potential is the potassium permeability the highest?
A.Phase 3
B.Phase 1
C.Phase 2
D.Phase 4
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_q_ckda.png)
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_panel_vip.png)
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_q_wyda.png)
- · 有4位网友选择 C,占比50%
- · 有2位网友选择 B,占比25%
- · 有1位网友选择 A,占比12.5%
- · 有1位网友选择 D,占比12.5%
A.Phase 3
B.Phase 1
C.Phase 2
D.Phase 4
A、The First Amendment to the U.S. Constitution
B、The Second Amendment to the U.S. Constitution
C、The Third Amendment to the U.S. Constitution
D、The fourth Amendment to the U.S. Constitution
A、tricuspid valve
B、bicuspid valve
C、mitral valve
D、semilunar valve
A、Excess extracellular fluid calcium ions
B、Increased sympathetic activity
C、Increased body temperature
D、Decreased extracellular fluid potassium ions
A、Ca2+ channel and K+ channel
B、Na+ channel and K+ channel
C、Na+ channel and Cl- channel
D、Na+ channel and Ca2+ channel
A、threshold potential is –40mV
B、very fast opening
C、responsible for initiating and propagating the action potential in fast response cells
D、not Tetrodotoxin sensitive
A、Sets the sequence of the contraction of atrium and ventricular muscle
B、The duration is about 250 msec, longer than that of skeletal muscle
C、Covers the period of contraction and part of the relaxation of the ventricular muscle
D、Makes the ventricular muscle systole and diastole occur alternately
A、Slow Ca2+ Channels
B、Fast Na+ Channels
C、Presence of actin and myosin
D、Na+-K+ pump
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