# Human Physiology Questions and Answers – Body Fluid and Circulation – Cardiac Cycle

This set of Human Physiology Multiple Choice Questions & Answers (MCQs) focuses on “Body Fluid and Circulation – Cardiac Cycle”.

1. Cardiac output is determined by _______
a) heart rate
b) stroke volume
c) blood flow
d) heart rate and stroke volume

Explanation: Stroke volume is an amount of blood pumped by the left ventricle of the heart in one contraction. The heart rate for adults ranges from 60-100 beats per minute.

2. In human being the duration of cardiac cycle is ___________
a) 0.008 sec
b) 0.5 sec
c) 0.8 sec
d) 8 sec

Explanation: The duration of the cardiac cycle is reciprocal of heart rate. Assuming a heart rate of 75 beats per minute, each cycle takes 0.8sec.

3. The volume of blood each ventricle pumps out during a cardiac cycle is about ___________
a) 70 ml
b) 5000 ml
c) 7 L
d) 1200 ml

Explanation: Cardiac output is a volume of blood pumped by the heart in a minute. It is equal to the heart rate multiplied by the heart stroke, so if there are 70 beats per minute and 70ml blood is ejected with each beat of the heart, the cardiac output is 4900ml per minute.

4. What is the definition of the cardiac cycle?
a) The contraction of the atria
b) Circulation of the blood in the heart
c) The contraction and relaxation of the ventricles
d) It is a sequence of event that occurs during one complete heartbeat

Explanation: The cardiac cycle refers to the sequence of mechanical and electrical events that repeats with every heartbeat. It includes diastole and systole.

5. Name the three phases of cardiac cycle in the order ____________
a) early diastole, mid-to-late diastole, ventricular systole
b) ventricular systole, mid-to-late diastole, Early diastole
c) mid-to-late diastole, Ventricular systole, Early diastole
d) early diastole, Ventricular systole, mid-to-late diastole

Explanation: Every beat of the heart involves 3 major stages. They are mid-to-late diastole, Ventricular systole, Early diastole.
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6. An electrocardiogram is a graphic illustration of ____________
a) cardiac conduction system
b) cardiac cycle
c) cardiac output
d) systemic and pulmonary circuits

Explanation: Electrocardiogram is a test which measures the electrical activity of the heart. It records the heart’s rhythm and activity on a moving strip of paper or a line on the screen.

7. The P wave of the ECG represents _______________
a) ventricular depolarization
b) atrial depolarization
c) ventricular repolarization
d) atrial systole

Explanation: P wave is the first wave. It represents atrial depolarization. P wave is followed by QRS complex and T wave.

8. Which of the following is not true for ventricular systole?
a) The ventricles relax
b) The ventricles contract
c) The semi lunar valves close
d) The atrioventricular valves open

Explanation: Systole is the last stage of the heartbeat. It happens right after the diastole.

9. The two distinct heart sounds during the cardiac cycle are lub and dup.
a) True
b) False

Explanation: The two distinct heart sounds during the cardiac cycle is lub and dup. The first heart sound is lub and is followed by dup.

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