(Solved): Can you answer question number 10, 12, and 13
10. Tetanic muscle contraction (aka summation of te ...
Can you answer question number 10, 12, and 13
10. Tetanic muscle contraction (aka summation of tension) does not occur in normal cardiac muscle because a. Cardiac muscle tissue contracts on its own b. Neural stimulation of cardiac muscle is necessary to begin an action potential c. The absolute refractory period lasts until the muscle begins to relax d. The absolute refractory period ends before the muscle reaches peak tension e. Potassium channels outnumber sodium channels in the membrane of cardiocytes 11. The following are structural components of the conducting system of the heart 1. Purkinje fibers 2. AV bundle 3. AV node 4. SA node 5. Bundle branches (right and left) The sequence in which excitation would move through this system is: a. 1,4,3,2,5 b. 3,2,4,5,1 c. 3,5,4,2,1 d. 4,3,2,5,1 e. 4,2,3,5,1 12. At just slightly after the peak of the QRS complex, which are the following is true? a. Heart is in atrial systole b. AV valves are open c. Heart is in ventricular systole d. Heart is in ventricular diastole e. A and C 13. At just slightly after the peak of the P wave, which of the following is true? a. The AV valves are closed b. The semilunar valves are closed c. The atrial are in diastole d. The ventricles are in systole e. All of the above are true