Describe the path of blood circulation Essay
Deoxygenated blood enters the right atrium through the superior and inferior vena cava. Superior vena cava is found at the top of the top of the right atrium and the inferior vena cava is located at the bottom of the right atrium. The blood is deoxygenated because the cell membranes have absorbed all the oxygen that was available in it. From the right atrium, blood flows into the right ventricle through the tricuspid valve. Tricuspid valve is also called the right atrioventricular valve because it is allocated between atrium and ventricles (Herlihy, 2014, pg 200 ). The ventricles contract and the tricuspid valve close to stop back flow of blood into the right atrium. Deoxygenated blood flows into the pulmonary artery through the pulmonary semi lunar valve. Semi lunar valve stops blood from flowing back into the right ventricles once it enters the right pulmonary. The deoxygenated blood is carried to the lungs by the pulmonary artery for purification.
Oxygenated blood flows back to the heart through the pulmonary veins into the left atrium. The left atrium relaxes, the oxygenated blood flows into the left ventricle through the left atrioventricular (AV) valve. The valve is also called bicuspid valve because it has only two flaps. The left ventricles contracts, the oxygenated blood are pumped into the aorta through the aortic semi lunar valve. The valve stops blood from flowing back into the left ventricle (Herlihy ,2014, pg 201).The aorta branches into other arteries which then branch into smaller arterioles. The arterioles meet with the capillaries where oxygen is exchanged with carbon dioxide.
The capillaries allow essential materials like water to diffuse out to maintain the health of the cell (The Circulatory System,n.d.). The capillaries also transport waste and carbon dioxide out of the cells. Apart from the waste exchange at the end of the capillary oxygen also leaves the red blood cells into the bloodstream.
References
Herlihy, B. (2014). The Human Body in Health and Illness. 5th Edition. Texas: Houston. Elsevier Health Science
The Circulatory System. (n.d.). Retrieved July 16, 2015, from http://lsa.colorado.edu/: http://lsa.colorado.edu/essence/texts/heart.html
 
 

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