The circulation of red fluid in the blood vessels of human that carries oxygen and carbon dioxide from the tissues of the body. The blood comprised of a mild basic aqueous liquid that contains WBCs, RBCs, and platelets. The blood is red in color due to hemoglobin protein. The oxygenated blood appears red and deoxygenated blood appear purple. The pigment hemoglobin associates with oxygen that allow the blood to transport the oxygen from the lungs to the tissues of vertebrate animals. For the clotting of blood, several factors are associated to it such as platelets that are formed in plasma that avoid hemorrhage. The inferior and superior vena cava enters the blood into the heart that empties deoxygenated blood from the body into the right atrium. The leucocytes or white blood cells assist in defending the body against invading foreign agents such as bacteria. The flow of blood occurs as the contraction of atrium take place from right atrium into right ventricle via the open tricuspid valve. The blood-like other liquids moves from an area of the high-pressure area to a low-pressure area. The flow of blood is in a similar direction since the gradient of pressure reduces from arteries to capillaries to veins.
The velocity or rate of blood flow fluctuates varies inversely with the whole cross-sectional region of the vessels of blood. The velocity of blood flow reduces since there is an increase in the total cross-sectional region of the blood vessels. The capillaries have slow flow of blood that permits time for the interchange of nutrients and gases.
The resistance is opposed for the blood flow. The blood flow reduces as well as the resistance increases due to the decrease in the diameter of a vessel. Many resistance occurs because of the diameter of blood vessel like when the diameter of blood vessel decreases, there is an increase in the resistance and decrease in the flow of blood. While blood moving from the capillaries to the venules, there is very slight pressure found in the blood flow. The blood does not depend directly on the contraction of ventricle, rather it is based on the smooth muscle constriction in venous walls, movements of respiration as well as skeletal muscle action. There is a force driving the blood for the flowing of blood via blood vessel across a heart valve. By increasing pressure in the arteries, the blood flow reduces, and cardiac utility does not reimburse. In the veins, the increased pressure increases the blood flow as in arteries.
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