In ventricular fibrillation, there is no pattern visible in the EKG. What does this mean in terms of contraction? A. contraction will have no visible pattern either and the ventricles will be unable to eject much blood B. the pattern doesn't matter; contraction of the ventricles will not be affected as long as ventricular myocytes continue to depolarize and depolarize C. the ventricular myocytes will be unable to contract C. contraction will become constant and ventricles will be unable to fill with blood   2. Which structure follows depolarization of the SA Node and atria in the cardiac conduction system?

16. The T-wave in the electrocardiogram above is caused by:     repolarization of the ventricles, caused by K+ ions leaving ventricular muscle cells     depolarization of the ventricles, caused by Na+ ions leaving ventricular muscle cells     repolarization of the atria, caused by K+ ions leaving atrial muscle cells     depolarization of the atria, caused by Na+ ions leaving atrial muscle cells

4. A change in pulse pressure can be seen in a variety of medical conditions. What would you expect to happen to the pulse pressure in the following examples? a. In atherosclerosis there is a hardening of the arterial walls. Explain b. A damaged aortic semilunar valve does not seal properly and allows blood to flow back into the ventricle during diastole. Explain EXTENSIONS 1. Exercise for varying lengths of time and compare the blood pressure and pulse readings taken after each exercise period. You can run around the building, and attach the cuff upon returning. 2. Perform different types of exercise for the same amount of time and compare the blood pressure and pulse readings taken after each type of exercise. 3. Measure blood pressure 5, 10, and 15 minutes after stopping exercise, and compare readings as your heart returns to resting heart rate. 4. Measure blood pressure while lifting a weight with the opposite arm.

I need to calculate the approximate heart rate based on the given ECG results, but I can't get how to determine the length of time between two consecutive R waves. What I see, it's one second between the two highest waves (I suppose they are R waves). But it means the heart rate should be 60 beats per minute, but there is no option for this answer. Teach me how to determine correctly the length of time between two consecutive R waves.