1. When the walls between the atria and ventricles are closed forcibly, we can listen to the first sharp sound of the heart _____

Question

Fill in the blanks:

1. When the walls between the atria and ventricles are closed forcibly, we can listen to the first sharp sound of the heart ____.
2. The valves which are present in the blood vessels are closed to prevent the backward flow of blood, we can listen to a dull sound of the heart _____.
3. The cardiac cycle includes an active phase systole and a resting phase the diastole of atria and ______.
4. One cardiac cycle is completed in approximately ____seconds.
5. The time needed for atrial contraction is _______seconds.
6. The time needed for ventricular contraction is ________ seconds.

Answer 1

1. When the walls between the atria and ventricles are closed forcibly, we can listen to the first sharp sound of the heart ‘lubb’.
2. The valves which are present in the blood vessels are closed to prevent the backward flow of blood, we can listen to a dull sound of the heart ‘dubb’.
3. The cardiac cycle includes an active phase systole and a resting phase the diastole of atria and ventricles.
4. One cardiac cycle is completed in approximately 0.8 seconds.
5. The time needed for atrial contraction is 0.11 – 0.14 seconds.
6. The time needed for ventricular contraction is 0.27 – 0.35 seconds.