Blood

linage consists of three types of cells, red countercurrent cells that confine oxygen, disease-fighting becoming countercurrent cells, and family-clotting platelets, which atomic number 18 on the whole carried through with(predicate) plasma. Plasma is yellow(a) and consists of water, salts, proteins, vitamins, minerals, hormones, dissolved gases, and fats. Three types of occupation vessels make a entanglement of tubes throughout the proboscis. Arteries carry blood by from the plaza, and veins carry it toward the optic. Capillaries are tiny links between the arteries and the veins where oxygen and nutrients public exposure to body tissues. The inner forge of blood vessels is lined with cells that gain a smooth passage for the transfer of blood. This inner layer is skirt by connective tissue and smooth muscleman that attend the blood vessel to stretch forth or contract. Blood vessels expand during exercise to meet the increased remove for blood and to feeb le the body. Blood vessels contract after an dent to reduce haemorrhage and also to conserve body heat. Arteries effect one across thicker walls than veins so they clear withstand the wring of blood being pumped from the heart. Blood in the veins is at a lower pressure, so veins have one-way valves to hold 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 divide into two systems of circulation, systemic and pulmonary. The systemic circulation carries oxygenated blood from the hear t to all the tissues in the body except the ! lungs and returns deoxygenated blood carrying waste products, much(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 on a lower floor high pressure out of the left over(p) ventricle, through the aorta. Smaller...If you regard to get a full essay, baffle it on our website: OrderCustomPaper.com

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