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Explain Change of posture - Decreased Cardiac Output
When a person stands up from lying down posture, there is an immediate but transient fall in systolic blood pressure. This is because, upon standing, there is a pooling of venous blood in the lower limbs due to gravity. This leads to a decreased venous return, which in turn decreases the stroke volume and cardiac output causing a fall in the systolic pressure.
However, within fifteen seconds, the baroreceptor reflexes bring about a cardio acceleration and vasoconstriction. As a result, the blood pressure soon returns to normal or may rise above value due to overcompensation. You may work out the changes on standing.
Sterilizing water by boiling The presence of tiny living plants and animals makes water inappropriate for drinking. Such forms of life can only be seen by a microscope. We can
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what is friction?
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