Free Cardiac Cycle and Heartbeat MCQs with Answers
30 Cardiac Cycle and Heartbeat MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The cardiac cycle describes atrial systole, ventricular systole and diastole, including pressure changes, blood movement and the opening or closing of heart valves. It also covers the conduction pathway from the sinoatrial node through the atrioventricular node, bundle of His and Purkinje fibres, and relates these events to heartbeat sounds.
Last updated
30 questions · page 2 of 2
- A. Brain
- B. Heart
- C. Kidney
- D. Pancreas
Explanation: The Bundle of His conducts impulses from the AV node to ventricles, ensuring synchronized contraction of the heart.
Correct answer: Heart- A. 140-150
- B. 115-125
- C. 72-80
- D. None of these
Explanation: A normal resting adult pulse is commonly about 72 beats/min, and the listed 72-80 beats/min range falls within the usual resting range.
Correct answer: 72-80- A. Ventricular systole
- B. Ventricular diastole
- C. Atrial systole
- D. Atrial diastole
- E. Both during atrial systole and atrial diastole
Explanation: Explanation for this question will be added soon.
Correct answer: Ventricular systole- A. Purkinje fibers
- B. AV bundle
- C. Sinoatrial node
- D. Bundle of His
Explanation: The impulse starts in a small bundle of specialised cells located in the right atrium, called the SA node.
Correct answer: Sinoatrial node- A. It sends out electrical impulses to ventrictes to contract.
- B. It is present at upper end of the left atrium
- C. It consists of small number of diffusely oriented cardiac fibers
- D. It sends out electrical impulses to atrial muscles causing both atria to contract.
Explanation: Explanation:SA node or the pacemaker is located in the right atrium and it sends out impulses causing both Atria to contract.
Correct answer: It sends out electrical impulses to atrial muscles causing both atria to contract.- A. It sends out electrical impulses to atrial muscles causing both atria to contract
- B. It consists of small number of diffusely oriented cardiac fibres
- C. It sends out electrical impulses to ventricular muscles causing both ventricles to contract
- D. It is present at upper end of left atrium
Explanation: Option [a] The Sinoatrial node, also known as the pacemaker, is responsible for initiating the heartbeat.
Correct answer: It sends out electrical impulses to atrial muscles causing both atria to contract- A. Ventricular systole
- B. Atrial systole
- C. Diastole
- D. Recovery systole
Explanation: The QRS complex represents depolarization of the ventricles and is followed by ventricular contraction which is collectively known as the…
Correct answer: Ventricular systole- A. 1 second
- B. 0.1 second
- C. 2 seconds
- D. 0.2 second
Explanation: The sinoatrial node (SAN) initiates the heartbeat and sends signals to the atrioventricular node (AVN) with a delay of about 0.1 second.
Correct answer: 0.1 second- A. Atrial systole
- B. Atrial diastole
- C. Ventricle systole
- D. Ventricle diastole
Explanation: The second part of ECG is the QRS complex which features a small drop in voltage (Q) a large voltage peak ( R ) and another small drop in…
Correct answer: Ventricle systole- A. Human heart
- B. Human lungs
- C. Human stomach
- D. Human brain
Explanation: Option A is correct.The Purkinje fibers are the specialized fibers found in the human heart.
Correct answer: Human heart