Cusps ot left AV valve Lef artery Right ventricle Lett ventricle Cusps of pulmon

Question

Cusps ot left AV valve Lef artery Right ventricle Lett ventricle Cusps of pulmonary semilunar vaive trunk Anterior Figure 21.10 The Coronary Circulation. Superior view of the human heart with the atria removed. All tour valves of the heart can be where the right and left coronary arteries come off of the aorta, and you can see the cusps of both the pulmonary semilunar valve within the pulmonary trunk and the ao rtic semilunar valve within the aorta. When the ventricles relax, the cusps of the aortic semilunan valves close as they fill with blood. Thus, they are no longer covering the openings to the coronary arteries. What consequence does this have in terms of blood flow to the heart wall during ventricular relaxation (diastole)? INTEGRATE

Explanation / Answer

1 Blood flow into the coronary arteries is maximum during ventricular diastole.

2. Expected ECG changes in normal people following exercise are

Decreased PR Interval
Increase in septal Q wave amplitude.
The R wave amplitude increases initially and then decreases to a minimum at peak of exercise
T wave peak may be taller
QT interval may show a shortening and there may be superimposition of P waves and T waves on consecutive beats
There may be a minor changes in P wave amplitude and QRS complex

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