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Heart pumps blood more forcefully in older persons than younger ones due to
- a)Decrease in oxygen content of blood
- b)Decrease in elasticity of arteries
- c)Fall in nutrient content of blood
- d)Increase in elasticity of arteries
Correct answer is option 'B'. Can you explain this answer?
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Heart pumps blood more forcefully in older persons than younger ones d...
As one ages, arteries lose their elasticity. Consequently the heart has to pump the blood more forcefully in order to fulfill the need of the body cells.
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Heart pumps blood more forcefully in older persons than younger ones d...
Explanation:
As a guide, the answer to this question is as follows:
As humans age, the walls of their arteries become less elastic and more rigid. The heart has to work harder to pump blood through these stiffened arteries, which results in increased force of blood pumped.
This increased force is due to the following reasons:
1. Decrease in elasticity of arteries: With age, the arteries lose their elasticity and become less flexible. This means that they cannot expand as easily to accommodate the increased blood flow during each heartbeat. As a result, the heart has to pump harder to force the blood through the stiffened arteries.
2. Increase in peripheral resistance: Peripheral resistance refers to the resistance to flow of blood in the small arteries and capillaries. As we age, the peripheral resistance increases due to the narrowing of the small arteries and an increase in the amount of fatty deposits in the blood vessels. This also puts extra pressure on the heart to pump blood more forcefully.
3. Changes in the heart muscle: The heart muscle also changes with age, becoming stiffer and less flexible. This means that it cannot contract as easily to pump blood out of the heart. To compensate for this, the heart has to pump harder to push the blood out.
Overall, these changes in the cardiovascular system with age lead to an increased force of blood pumped by the heart.
As a guide, the answer to this question is as follows:
As humans age, the walls of their arteries become less elastic and more rigid. The heart has to work harder to pump blood through these stiffened arteries, which results in increased force of blood pumped.
This increased force is due to the following reasons:
1. Decrease in elasticity of arteries: With age, the arteries lose their elasticity and become less flexible. This means that they cannot expand as easily to accommodate the increased blood flow during each heartbeat. As a result, the heart has to pump harder to force the blood through the stiffened arteries.
2. Increase in peripheral resistance: Peripheral resistance refers to the resistance to flow of blood in the small arteries and capillaries. As we age, the peripheral resistance increases due to the narrowing of the small arteries and an increase in the amount of fatty deposits in the blood vessels. This also puts extra pressure on the heart to pump blood more forcefully.
3. Changes in the heart muscle: The heart muscle also changes with age, becoming stiffer and less flexible. This means that it cannot contract as easily to pump blood out of the heart. To compensate for this, the heart has to pump harder to push the blood out.
Overall, these changes in the cardiovascular system with age lead to an increased force of blood pumped by the heart.
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Heart pumps blood more forcefully in older persons than younger ones due toa)Decrease in oxygen content of bloodb)Decrease in elasticity of arteriesc)Fall in nutrient content of bloodd)Increase in elasticity of arteriesCorrect answer is option 'B'. Can you explain this answer?
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