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------------------------------------------------ By what action does blood enter the capillary tube?

Blood enters the capillary tube through a process called capillary action, wherein the blood is drawn into the tube due to adhesive forces between the blood and tube molecules. This process is driven by hydrostatic and osmotic pressure.

Explanation:

Blood enters the capillary tube by a process called capillary action. Capillary action is the tendency of a fluid to be raised or suppressed in a narrow tube. In this case, blood is the fluid and the capillary tube is the narrow tube. When one end of the tube is introduced into the blood, the blood molecules are strongly attracted to the tube molecules. Consequently, the blood creeps up the inside of the tube, balanced by the weight of the blood itself and the adhesive forces between the blood and tube molecules. Two paramount forces drive this action, these are hydrostatic pressure and osmotic pressure. Hydrostatic pressure is the force exerted by blood against the walls of the blood vessels due to the heart's pumping action, while osmotic pressure involves the movement of water or fluid from an area of low concentration to an area of high concentration.

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