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Transcript of Circulatory System
By: Vy Doan, Kaitlyn McKinley, Kaitlin Crossland
As blood circulates around the body, it picks up oxygen from the lungs, nutrients from the small intestine, and hormones from the endocrine glands, and delivers these from the cells. Blood then picks up carbon dioxide and cellular wastes from cells and delivers these to the lungs and kidneys, where they're excreted.
The heart is one of the most fascinating and crucial organs in the human body. The main task that it carries out is the pumping of blood within the body, constantly receiving, purifying, and dishing out blood to various parts of the body. The human heart is located roughly in the center cavity of the chest, and is divided into 4 chambers - the left atrium, the right atrium, the left ventricle, and the right ventricle. These chambers perform their own individual functions independently, and thus the heart pumps oxygenated blood to the body, and de-oxygenated blood back to the lungs.
Blood transports oxygen from the lungs and delivers it to cells. It picks up carbon dioxide from the cells and and brings it to the lungs. Blood is composed of plasma [liquid portion] and blood cells. The three types of cells in the blood are red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes).
The blood vessels of the body [arteries, capillaries, and veins] make up a closed system of tubes that carry blood from the heart to tissues all over the body and then back to the heart.
The major functions of the circulatory system is to transport nutrients, oxygen, carbon dioxide, nitrogenous wastes, hormones, water, heat, and metabolites to the body and body cells.
Though the lungs is not necessarily part of the circulatory system, it's needed in the circulation of the blood. Due to the fact, it brings oxygen into the bloodstream and takes carbon dioxide out of the bloodstream.
One of the most common diseases of the circulatory system is arteriosclerosis, in which the fatty deposits in the arteries causes the walls to stiffen and thicken the walls. The causes are too much fat, cholesterol and calcium. This can restrict blood flow or in severe cases stop it all together, resulting in a heart attack or stroke. Another circulatory is disease, hypertension — commonly called high blood pressure — causes the heart to work harder and can lead to such complications as a heart attack, a stroke, or kidney failure.
When you think about how the circulatory system works with other body systems, you probably think of the respiratory system. This is because the circulatory system has a direct path through the lungs. When blood returns from the body to the heart, it is depleted of oxygen. It has to pick up oxygen in the lungs before it can return to circulation.
Systemic circulation is a major part of the overall circulatory system. During the systemic circulation, blood passes through the kidneys. During the renal circulation phase, the kidneys filter much of the waste from the blood. Blood also passes through the small intestine during systemic circulation. During the portal circulation phase, the blood from the small intestine collects in the portal vein which passes through the liver. The liver filters sugars from the blood, storing them for later.
Pulmonary circulation is the movement of blood from the heart, to the lungs, and back to the heart again. This is just one phase of the overall circulatory system. Blood cells enter pulmonary circulation after returning from a trip around the body and enter the right atrium of the heart through two major veins, the superior and inferior vena cava. At this point in the journey, the blood cells do not contain any oxygen. From the atrium, the heart pushes the blood through the tricuspid valve into the right ventricle and then through the pulmonary valve into the pulmonary artery. The pulmonary artery splits in two and carries the blood to both lungs where it will receive oxygen.
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