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1. Which of the following statements is false? a. The action potential of a cardiac contractile...

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Medical Sciences

1. Which of the following statements is false?

a. The action potential of a cardiac contractile cell has aplateau.

b. The action potential of a cardiac contractile cell has threephases.

c. The action potential of a cardiac contractile cell has agradual depolarization.

d. The action potential of a cardiac contractile cell returns torest.

2. The electrical axis of the heart corresponds to:

a. The conduction of the heart

b. The cardiac contractile cell action potential

c. The cardiac nodal cell action potential

d. The orientation of the heart

Answer & Explanation Solved by verified expert
4.3 Ratings (937 Votes)
Ans1 bThe action potential of a cardiac contractile cell has three phases There are five cardiac action potential phases numbered 0 through 4 Phase 0 is depolarization of the membrane and the opening of fast ie highflow sodium channels Potassium flow also decreases Phase 1 is partial repolarization of the membrane thanks to a    See Answer
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