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Why does the Heart beat? Video Lecture | Science Class 7

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FAQs on Why does the Heart beat? Video Lecture - Science Class 7

1. Why does the heart beat?
Ans. The heart beats to pump blood throughout the body. It is a muscular organ that contracts and relaxes rhythmically, allowing blood to flow and deliver oxygen and nutrients to the various organs and tissues.
2. How does the heart beat?
Ans. The heart has its own electrical system that controls its rhythm. A group of cells called the sinoatrial (SA) node, also known as the natural pacemaker, sends electrical signals to the heart muscle, causing it to contract and pump blood.
3. What is the average heart rate?
Ans. The average heart rate for a resting adult is around 60-100 beats per minute. However, it can vary depending on factors such as age, fitness level, emotions, and activity level.
4. Can heart rate be too high or too low?
Ans. Yes, a heart rate can be too high or too low. A high heart rate, known as tachycardia, can be caused by factors such as stress, exercise, fever, or certain medical conditions. A low heart rate, known as bradycardia, can be caused by factors such as certain medications, heart disease, or an underactive thyroid.
5. What can affect the heart rate?
Ans. Several factors can affect the heart rate, including physical activity, emotional state, body temperature, medications, caffeine, nicotine, and certain medical conditions. Additionally, age and fitness level can also influence the heart rate.
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