Dr Insiyah R. answered on
Nov 20 2022
Blood flow 1
The term "blood flow" describes the process by which blood travels from the heart via the capillaries and finally into the veins. Blood pressure is the force that the blood presses against the vessel walls as it flows through the body. Blood, like other fluids, prefers to go from higher to lower pressure. As the pressure gradient decreases, blood travels from arteries to capillaries to veins (Arzani et al,2021).
The liquid that makes up the blood is a complicated substance. There are both plasma and formed components in blood. Water makes up 91.5% of the plasma, followed by 7.0% protein and 1.5% other soluble compounds. A variety of blood cells, including platelets, white blood cells, and red blood cells, are produced. Blood is not like a perfect Newtonian fluid because of the existence of formed components and the interaction those elements have with plasma molecules (Arzani et al,2021).
Capillaries link arteries and veins and play an essential part in transporting oxygen, nutrients, and metabolic waste products from the circulatory system to the cells of the body's tissues. Capillaries allow substances to move through the body through diffusing, filtering, and osmosing (Herman et al,2016).
Gases like oxygen and ca
on dioxide may travel freely between the two sides by diffusing through the capillary wall. The pressures exerted by hydrostatic and osmotic forces, respectively, are what ultimately governs the rate at which fluids pass through a capillary wall. Hydrostatic and osmotic pressure combine to form a capillary microcirculation, in which things leave the blood at one end and return at the other (Ellahi et al,2014).
The speed at which blood flows through a blood vessel is directly proportional to its cross-sectional area. When the overall vessel cross-section rises, flow velocity falls. The capillaries have slow blood flow, allowing for the most efficient exchange of gases and nutrients (Ellahi et al,2014).
When a force acts against the motion of a fluid, it is called resistance. The diameter of the blood arteries is the main factor in the resistance encountered by the blood. Blood flow is reduced, and resistance is increased when the diameter of a blood artery is reduced. Once the blood has passed through the capillaries and into the venules, little pressure is left. Veins do not get blood directly as a consequence of ventricular contraction. Instead, the contraction of smooth muscle in the venous walls, the activity of skeletal muscles during respiration, and the...