Through aortic semilunar valve through the aorta 10 Through the coronary

Through aortic semilunar valve through the aorta 10

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Through aortic semilunar valve through the aorta 10. Through the coronary arteries to the heart tissues 11. Then through the coronary veins 12. To the coronary sinus which sends the blood back to the atrium 13. Repeats 2. Trace the sequence of excitation of an impulse in the intrinsic conduction system a. The Sinoatrial (SA) node generates impulses b. The impulses pause at the atrioventricular (AV) node c. The atrioventricular (AV) bundle conduct the impulses to the bundle branches d. The bundle branches conduct the impulse through the interventricular septum e. Which travels to the purkinje fibers and makes the heart beat
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3. What are pacemaker cells? Where does the stimulus for action potential initiation come from? What makes the heart beat continuously without interruption? Pacemaker cells are a network of noncontractile, autorhythmic cells that produce electrical charges from positive to negative and back. These electrical charges initiate and distribute impulses to coordinate, depolarize and contact heart. The stimulus for action potential comes from opening Na+ channels and closing of K+ channels The heart depolarizes and contracts without nervous system stimulus due to the intrinsic cardiac conduction system. This is a network of non contractile cells
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  • Fall '20
  • right ventricle, left ventricle, right atrium, tricuspid valve, left atrium

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