Blood enters into the ventricles during the following phase of the cardiac cycle
ID: 90993 • Letter: B
Question
Blood enters into the ventricles during the following phase of the cardiac cycle: a) Filling b) Isovolumic Contraction c) Ejection d) Isovolumic Relaxation e) None of the above The pressure increases while the volume remains the same during the following phase of the cardiac cycle: a) Filling b) Isovolumic Contraction c) Ejection d) Isovolumic Relaxation e) None of the Above Blood is transported out of the ventricles into the arteries extending from them during the following phase of the cardiac cycle: a) Filling b) Isovolumic Contraction c) Ejection d) Isovolumic Relaxation e) None of the Above The pressure decreases while the volume remains the same during the following phase of the cardiac cycle a) Filling b) Isovolumic Contraction c) Ejection d) Isovolumic Relaxation e) None of the Above AV valves open leading to the onset of the following phase of the cardiac cycle: a) Filling b) Isovolumic Contraction c) Ejection d) Isovolumic Relaxation e) NExplanation / Answer
72.ans: option a). filling
The atrial systole is the last phase of a diastole during which the ventricularfilling is completed. The atrioventricular valves are open; the semilunar valves are closed . The atria contract to eject blood into the ventricles.
74.ans:-option-c). ejection.
This phase represents initial, rapid ejection of blood into the aorta and pulmonary arteries from the left and right ventricles, respectively.
75.ans:-option:d)isovolumic relaxation.
The rate of pressure decline in the ventricles is determined by the rate of relaxation of the muscle fibers, which is termed lusitropy. This relaxation is regulated largely by the sarcoplasmic reticulum that are responsible for rapidly re-sequestering calcium following contraction
Although ventricular pressures decrease during this phase volume do not change because all valves are closed.
The volume of blood that remains in a ventricle is called the end-systolic volume and is ~50 ml in the left ventricle. The difference between the end-diastolic volume and the end-systolic volume is ~70 ml and represents the stroke volume.
73.ans:-option:b)iso volumic contraction.
76.ans:-option:a) filling.