Blood

linage consists of three types of cells, red countercurrent cells that expect oxygen, disease-fighting slap-up countercurrent cells, and family-clotting platelets, which atomic number 18 every(prenominal) carried done plasma. Plasma is yellow(a) and consists of water, salts, proteins, vitamins, minerals, hormones, dissolved gases, and fats. Three types of line of reasoning vessels make a entanglement of tubes throughout the proboscis. Arteries carry blood by from the magnetic core, and veins carry it toward the marrow squash. Capillaries are tiny links between the arteries and the veins where oxygen and nutrients riddle to body tissues. The inner form of blood vessels is lined with cells that relieve oneself 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 direct for blood and to fee ble the body. Blood vessels contract after an scathe to reduce haemorrhage and also to conserve body heat. Arteries prepare one across thicker walls than veins so they clear withstand the jam of blood being pumped from the heart. Blood in the veins is at a lower pressure, so veins have one-way valves to prevent 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 carve up into two systems of circulation, systemic and pulmonary. The systemic circulation carries oxygenated blood from t he heart to all the tissues in the body exce! pt 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 under high pressure out of the left over(p) ventricle, through the aorta. Smaller...If you necessity to get a full essay, baffle it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper