Ouestions 11-15 Refer to the ECG\'s shown below This electrocardiogram (a) is no

Question

Ouestions 11-15 Refer to the ECG's shown below This electrocardiogram (a) is noemal and the person is exercising This electrocardsogram (b) is not normal and the person is at rest II. What is happening to the electrical activity of the beart at the arrows shown in (ay? a. atria are depolarizing and ventricles are repolarizing b, atria are repolarizing and ventricles are depolarizing c. atria and ventricles are both depolarizod d. atria and ventricles are both repolarized 12. What phase of the cardiac cycle would be occurring at the arrows shown in (a)? a atrial systole-ventricular diastole c, atrial systole-ventricular systole b. atrial diastole- ventricular systole d. atrial diastole-ventricular systole 13. What is happening to the heart valves at the arrows shown in (a)? a. atrioventicular and semilunar valves are both closed b. atrioventicular and semilunar valves are both opern c atrioventicular valves are open and semilunar valves are closed d. atrioventicular valves are closed and semilunar valves are open 14. The bottom electrocardiogram (b) most likely shows: a. no P-wave, SA node is not working b. no P-wave, AV node is not working c. no T-wave, SA node is not working d. no T-wave, AV node is not working 15. Which of the following would most likely NOT occur in the person with the bottom electrocardiogram (b)? a. atrial systole c. ventricular systole b. atrial diastole d. ventricular diastole 16. The blood pressure wave measured in systemic arteries is called the: a. circulation time b. pulse c. pulse interval d. cardiac output

Explanation / Answer

ANSWER : 11 The R-wave peak of QRS wave (complex) is shown by the arrows in the given figure (a) that represents ventricular depolarisation (ventricular contraction) and atrial repolarisation (atrial relaxation).

ANSWER : 12 The two phases of cardiac cycle, Ventricular systole (ventricle contraction) and Atrial diastole (atrial relaxation) is shown by arrows in figure (a).

ANSWER : 13 At the time of QRS wave (complex) of elecrtric activity of heart due the contraction of ventricle "Semilunar valves" of heart open while "Atrioventricular valves" be closed due to atrial relaxation (blood enter in the atria).

ANSWER : 14 In the given figure (b) there no P-wave of ECG that happened because the SA node of heart is not working properly.

ANSWER : 15 The Atrial systole or depolarisation is not shown in the figure (b) that represents by the P-wave of electrocardiograph.

ANSWER : 16 The blood pressure measured in systemic artery is kown as "Pulse". The normal pulse of a healthy adult person is about to 72 beats per minute.

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