Why water and Roughage are important part of our diet ? Explain.
Where does heart beat originate? How is this impulse conducted to heart
muscles ? What is the effect of this impulse on various chambers of the
heart ?
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- Roughage does not provide any nutrient to our body, but is an essential component of our food and adds to its bulk. This helps our body get rid of undigested food. ... Water helps our body to absorb nutrients from food. It also helps in throwing out some wastes from body as urine and sweat.
- SA node (sinoatrial node) – known as the heart's natural pacemaker. The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node. The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles.
- This electrical impulse spreads into the ventricles, causing the muscle to contract and to pump blood to the lungs and the body. Chemicals which circulate in the blood, and which are released by the nerves that regulate the heart, alter the speed of the pacemaker and the force of the pumping action of the ventricles.
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