Give two reasons why the pressure decreases as blood flows along the capillary bed. =because it avoide the mixed up of the blood
1st reason: the radius of arterioles is smaller compared to radius of arteries so since arteries supply blood to the arterioles,arterioles offer resistance to the blood flow thus the pressure of blood in the arterioles decreases which is the reason why pressure of the blood in the capillaries is low
2nd reason: also because capillaries are situated far from the heart,which is the pump that creates pressure within the blood vessels so the further you go away from the heart the lower the pressure within the blood vessels as a result that blood volume decreases with the increase in the distance from the heart e.g there is more water in a river(source) than its tributaries which get their water from this river