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Water Blood Hp Idea Higher Wp Describe Explain

As blood flows along a capillary, high hydrostatic pressure at the arterial end forces water out, while lower hydrostatic pressure and the higher water potential at the venous end due to proteins allow water to return by osmosis.

As blood flows along a capillary, high hydrostatic pressure at the arterial end forces water out, while lower hydrostatic pressure and the higher water potential at the venous end due to proteins allow water to return by osmosis.

Front Describe and explain how water is exchanged between the blood and tissue fluid as blood flows along the capillary. ( 4 marks)
Back HP forces water out; 
idea that HP is “higher” than WP; 
proteins remain in blood (increases WP); 
idea that WP is now “higher” than HP; water returns by osmosis / along WP gradient; 
water moves out at arteriole end and back in (at venule end);

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