Cardiovascular System

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Cardiovascular System

Arteries, Capillaries, and Veins

Cardiovascular System

Path of Blood Through the Heart Right Side: Blood enters the heart through the inferior and superior vena cava, into the right atrium. The blood flows from the right atrium into the right ventricle through the open tricusped valve. when full, this valve will close to prevent back flow of blood into the atrium. As the ventricle contracts, blood leaves the heart to the pulmonary artery and finally to the lungs where it is oxygenated.Left Side: The pulmonary vein empties the oxygen rich blood from the lungs into the left atrium. The blood flows then to the left ventricle through the bicusped valve (similar to the process in the right side of the heart). As the ventricle contract, blood flows through the aortic semilunar valve, into the aorta and rest of the body.

- Arteries- Capillaries- Veins- Path of the Blood Through the Heart- Blood

Red blood cells are bright red to dark purple coloring bioconcave disks without nuclei that transport oxygen to the body while simultaniously removing wastePlatelets are disk shapped cell fragments with no nuclei that aid in the clotting of bloodWhite blood cells are granular and agranular leukocytes that consist of neutrophils, eosinophils, basophils, lymphocytes, and monocytes that fight infection

Arteries and arterioles carry blood away from the heart. They have three layers: an outer, fibrous layer, a middle layer of smooth muscle, and an inner endothelium. Constriction and dilation of arterioles regulates blood flow and pressure.Capillaries join arterioles to venules and consist of a single layer of endothelium attatched to a basement membrane. Capillaries play a critically important role in exchange of gases, nutrients, and wastes between tissues and blood. Veins return blood from the capillaries to the heart. Their walls are thinner than those of arteries and also contain more blood than arteries and capillaries combined


BUY IN: It is important to understand how the cardiovascular system works as it is most essential for the sustainment of our lives.TIE IN: The cardiovascular system is essential in not only humans but in all animals on earth and understanding the system can help us prevent many diseases of the heart, which is the leading casue of death in the U.S.


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