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Cardiac Cycle : Body Fluids and Circulation Video Lecture | Biology Class 11 - NEET

FAQs on Cardiac Cycle : Body Fluids and Circulation Video Lecture - Biology Class 11 - NEET

1. What is the cardiac cycle and its main phases?

Ans. The cardiac cycle refers to the sequence of events that occur in the heart during one complete heartbeat. It consists of two main phases: diastole and systole. During diastole, the heart muscles relax, allowing the chambers to fill with blood. In contrast, during systole, the heart muscles contract, pumping blood out of the heart to the lungs and the rest of the body.

2. How does blood flow through the heart during the cardiac cycle?

Ans. Blood flows through the heart in a specific order during the cardiac cycle. It enters the right atrium from the body via the superior and inferior vena cavae, then moves to the right ventricle, where it is pumped to the lungs for oxygenation. Oxygen-rich blood returns to the left atrium, flows into the left ventricle, and is then pumped out to the body through the aorta.

3. What role do valves play in the cardiac cycle?

Ans. Valves in the heart are crucial for ensuring unidirectional blood flow. They open and close in response to pressure changes during the cardiac cycle. The atrioventricular valves (tricuspid and mitral) prevent backflow from the ventricles to the atria during contraction, while the semilunar valves (pulmonary and aortic) prevent backflow into the ventricles after blood is pumped out.

4. What is the significance of the cardiac output during the cardiac cycle?

Ans. Cardiac output is the volume of blood the heart pumps per minute and is an essential measure of heart function. It is calculated by multiplying stroke volume (the amount of blood pumped with each heartbeat) by heart rate. Adequate cardiac output is vital for delivering oxygen and nutrients to tissues and removing waste products.

5. How does the autonomic nervous system regulate the cardiac cycle?

Ans. The autonomic nervous system regulates the cardiac cycle through its two branches: the sympathetic and parasympathetic systems. The sympathetic system increases heart rate and contractility during stress, while the parasympathetic system, primarily through the vagus nerve, decreases heart rate during rest. This balance helps maintain homeostasis and respond to the body's needs.

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Sep 19, 2025 Last updated

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NEET Class 11

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	Biology Class 11 150 videos\|398 docs\|136 tests

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150 videos|398 docs|136 tests

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