Asked by Federico Maeso on Jul 12, 2024
Verified
Which of the following statements concerning the cardiac cycle is true?
A) Blood enters the right and left atria only during diastole.
B) Most ventricular filling occurs before the atria contract.
C) During ventricular systole, the AV valves open.
D) The semilunar valves remain closed throughout ventricular systole.
E) Most of end-diastolic volume comes from active filling.
Cardiac Cycle
refers to the sequence of events that occur in the heart during one beat, including the contraction (systole) and relaxation (diastole) periods.
Diastole
The phase of the heart cycle when the heart muscle relaxes and allows the chambers to fill with blood.
Ventricular Filling
The phase of the cardiac cycle in which the ventricles fill with blood, following diastole and before systole.
- Acquire knowledge of the cardiac cycle's steps and their association with the electrical occurrences in the heart.
Verified Answer
BM
Bianca MonteiroJul 16, 2024
Final Answer :
B
Explanation :
Most of the ventricular filling (about 70-80%) occurs passively before the atrial contraction. The atrial contraction (atrial systole) contributes to the remaining 20-30% of the filling, ensuring complete ventricular filling before ventricular systole begins.
Learning Objectives
- Acquire knowledge of the cardiac cycle's steps and their association with the electrical occurrences in the heart.