In which of these conditions is the mitral valve closed? When the Left atrium is
ID: 164520 • Letter: I
Question
In which of these conditions is the mitral valve closed? When the Left atrium is contracting/systole When the left ventricle Is contracting/systole. When the left ventricle is relaxing/diastole When the left atrium is relaxing/diastole When does the Aortic valve dose? When the pressure I the left ventricle is higher than the pressure in the aorta When the pressure in the left ventricle is lower than the pressure in the Aorta When the pressure in left atrium Is higher than the pressure in the left ventricle. All of the above. During systole of a heart chamber, the pressure in the chamber. __ (increase/decrease), but the volume of Wood in that chamber __, (increases/decreases). The length of the cardiac muscle fibers of that chamber __ (lengthen/shorten). Duration of cardiac cycle If the heart is beating at 75 bats/min is __ sec. Volume of blood contained in the ventricle at the end of Atrial systole is called __. Define End systolic volume. There is a phase of cardiac cycle during which the ventricular muscle fibers are contracting, but, not actively shortening. The volume of blood. in the chamber remains the same. The Mitral and Aortic valves are closed. This phase is __. During the phase of mid ventricular diastole/Relaxation phase, the atria and ventricles are in diastole, blood flows passively from atria into the ventricles. (true/False) During Late ventricular diastole: Atria are relaxing/in Diastole Ventricles are contracting/in systole Atria are contracting/in systole Aorta is in systole. in Left ventricular systole (Ejection phase) Compare the pressures in Left ventricle and Left atrium. Which is higher? Compare the pressures in left ventricle and Aorta. Which pressure is higher? Where Is blood from the ventricle moving into? What is the state of Mitral valve? (open/closed) What is the state of Aortic valve (open/closed)Explanation / Answer
1. B. When left ventricle is contracting /systole.
The mitral valve, is also known as the bicuspid valve or left atrioventricular valve. It lies between the left atrium and the left ventricle. When ventricles contract, pressure inside ventricles rises and this rise in ventricular pressure pushes the bicuspid and tricuspid valves up causing their closure.
2. B. When the pressure in the left ventricle is lower than the pressure in the sorts.
When ventricles relax, pressure inside ventricles falls below the pressure in great arteries. This fall in ventricular pressure, causes closure of semi lunar valves.
3. Increase.
Decrease.
Shorten.
4. 0.8.
5. End systolic volume.
6. It is the volume of blood in a ventricle at the end of contraction, or systole, and the beginning of filling, or diastole.