Blood

linage consists of three types of cells, red countercurrent cells that incorporate oxygen, disease-fighting straight countercurrent cells, and family-clotting platelets, which atomic number 18 all(prenominal) carried with plasma. Plasma is yellow(a) and consists of water, salts, proteins, vitamins, minerals, hormones, dissolved gases, and fats. Three types of extraction vessels make a entanglement of tubes throughout the proboscis. Arteries carry blood by from the kindling, and veins carry it toward the philia. Capillaries are tiny links between the arteries and the veins where oxygen and nutrients dispel to body tissues. The inner floor of blood vessels is lined with cells that urinate a smooth passage for the transfer of blood. This inner layer is skirt by connective tissue and smooth vim that attend the blood vessel to stretch forth or contract. Blood vessels expand during exercise to meet the increased take for blood and to feeble the body. Blood ves sels contract after an crack to reduce haemorrhage and also to conserve body heat. Arteries order one across thicker walls than veins so they clear withstand the mash of blood being pumped from the heart. Blood in the veins is at a lower pressure, so veins have one-way valves to rule out blood from flowing backwards away from the heart. Capillaries, which are the smallest of blood vessels, are only visible by microscope.

The arteries, veins, and capillaries are split up into two systems of circulation, systemic and pulmonary. The systemic circulation carries oxygenated blood from the heart to all the tiss ues in the body except the lungs and returns! deoxygenated blood carrying waste products, such(prenominal) as carbon dioxide, back to the heart. The pulmonary circulation carries this blood from the heart to the lungs. In the lungs, the blood releases its carbon dioxide and absorbs oxygen. The oxygenated blood then returns to the heart before transferring to the systemic circulation. The heart gets relieve of oxygen-rich blood chthonian high pressure out of the left over(p) ventricle, through the aorta. Smaller...If you privation to get a full essay, baffle it on our website: OrderCustomPaper.com

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