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Why does the Heart beat? Video Lecture | Science Class 7 (Old NCERT)

FAQs on Why does the Heart beat? Video Lecture - Science Class 7 (Old NCERT)

1. What causes the heart to beat?

Ans.The heart beats due to electrical impulses that originate from a group of cells called the Sinoatrial (SA) node, located in the right atrium. These impulses trigger the heart muscles to contract and pump blood throughout the body.

2. How does the heart's electrical system work?

Ans.The heart's electrical system consists of the SA node, the Atrioventricular (AV) node, and the bundle of His. The SA node sends out electrical signals that cause the atria to contract, then the signals reach the AV node, which delays them slightly before sending them to the ventricles, causing them to contract.

3. Why is a regular heartbeat important?

Ans.A regular heartbeat is crucial for maintaining effective blood circulation. It ensures that oxygen and nutrients are delivered to tissues and organs efficiently, and helps remove waste products from the body.

4. What factors can affect heart rate?

Ans.Factors that can affect heart rate include physical activity, emotional state, hormones, medications, and overall health. For instance, exercise increases heart rate to supply more oxygen to the muscles, while relaxation techniques can lower it.

5. What is the difference between a normal heartbeat and arrhythmia?

Ans.A normal heartbeat follows a regular rhythm and rate, typically between 60 to 100 beats per minute. Arrhythmia refers to any irregular heartbeat, which can be too fast (tachycardia), too slow (bradycardia), or erratic, potentially leading to health complications.

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Sep 03, 2025 Last updated

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	Science Class 7 (Old NCERT) 111 videos\|435 docs\|28 tests

Science Class 7 (Old NCERT)

111 videos|435 docs|28 tests

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