Human Circulatory System — Prelims Questions

Which of the following statements about the human heart is INCORRECT?

During a normal cardiac cycle, which of the following events occurs immediately after the closure of the AV valves?

A person with blood group 'A' requires a blood transfusion. Which of the following blood groups can be safely transfused to this person?

Which component of the ECG represents ventricular repolarization?

Which of the following statements correctly describes the role of platelets in blood coagulation?

Cardiac output is defined as the volume of blood pumped by each ventricle per minute. If the stroke volume is $70\,\text{mL}$ and the heart rate is $75\,\text{beats/min}$, what is the cardiac output?