Mid-Unit Summary

Mid-Unit Summary

       This unit began with the structure and function of the heart. The structure consists of the three layers with in the wall; epicardium, myocardium, the layer that contracts, and the endocardium, which lines the chamber of the heart. With in those layers of wall includes the four chambers which goes as followed. The Right Atria which receives oxygen deprived blood from the superior and inferior vena cava. From the right atria, the blood moves through the tricuspid valve into the right ventricle and then the blood moves through the pulmonary artery outside the heart and into the lungs. from the lungs the oxygen rich blood goes through the pulmonary veins, into the left atria, through the bicuspid valve, into the left ventricle and out through the aorta.
       If there is an instance where a person stalks up with plaque on the blood vessels, the persons blood pressure can increase which causes strokes if there is no blood flow to the brain, or a heart attack when there is no blood to the heart. Cardiac arrest comes when the heart completely shuts down and stops working. These thin and weak blood vessels occur because of fatty material that deposits on the inside of the blood vessel and makes it less flexible and harder for blood to flow.
       The cardiovascular system consists of major components such as the heart, arteries, blood away from heart, veins, blood back to heart, and blood, the fluid that fills the circulatory system. Accessory organs include the lungs where oxygen is taken in and carbon dioxide is  released, kidneys where wastes are removed from blood, small intestine where digestion and absorption occurs, large intestine where water is absorbed, liver where blood is detoxified, spleen where red blood cells are recycled, and bone marrow where spongy cells of bone make red blood cells.
       Blood pressure is a measure of the force excreted by the blood walls of the arteries. the systolic pressure is the result of the contraction of the ventricles while the diastolic pressure is during the ventricle relaxation.
       Red blood cells have no nucleus, no genetic material, and no mitochondria. cannot divide, carries oxygen, sometimes, and has about a 120 day lifespan. White blood cells are larger than RBC and they help fight off microbes. The white blood cells include neutrophils, basophils, eosinophilis, cymphocytes, and monocytes.