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any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood toward the heart

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The tricuspid valve sits between the heart's two right chambers. The tricuspid valve consists of three thin flaps of tissue. These valve flaps open to let blood flow from the upper right chamber to the lower right chamber.

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pieces of very large cells in the bone marrow, they help form blood clots to slow or stop bleeding and to help wounds heal, having too many or too few thrombocytes or having platelets that don't work as they should can cause problems

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period of ventricular contraction

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a partition separating two chambers, such as that between the chambers of the heart

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one of the four chambers of the heart, the right ventricle pumps blood low in oxygen to the lungs, in the lungs, the blood then gets a "refill" of oxygen

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one of the four chambers of the heart, the right atrium receives blood low in oxygen from the body and then empties the blood into the right ventricle

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one of four valves that control blood flow in the heart, it's between the lower right heart chamber and the artery that delivers blood to the lungs

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the colorless fluid part of blood, lymph, or milk, in which corpuscles or fat globules are suspended

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the membrane enclosing the heart, consisting of an outer fibrous layer and an inner double layer of serous membrane

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thickest heart layer, muscular middle layer

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one of the four heart valves, it has two cusps or flaps and lies between the left atrium and left ventricle of the heart

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White blood cells are not as numerous as are erythrocytes. They are formed in the bone marrow and lymph tissue and usually live about 3-9 days. A normal count is 4,500 to 11,000 leukocytes per cubic mL of blood. Leukocytes can pass through capillary walls and enter body tissue. Their main function is to fight infection.

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one of the four chambers of the heart, the left ventricle pumps blood full of oxygen out to the body

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one of the four chambers of the heart, the left atrium receives blood full of oxygen from the lungs and then empties the blood into the left ventricle

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A complex protein composed of the protein molecule called globin and the iron compound called heme. Hemoglobin carries both oxygen and carbon dioxide. When carrying oxygen, hemoglobin gives blood its characteristic red color. When blood contains a lot of oxygen, it is bright red; when blood contains less oxygen and more carbon dioxide, it is a much darker red with a bluish cast.

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red blood cells are produced in the red bone marrow at a rate of one million per minute, they live approximately 120 days before being broken down by the liver and spleen, there are 4.5 to 6 million erythrocytes per cubic mL pf blood, or approximately 25 trillion in the body

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a smooth layer of cells that lines the inside of the heart and is continuous with the inside of the blood vessels

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the phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood

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The circulatory system, also known as the cardiovascular system, is often referred to as the "transportation" system of the body. It consists of the heart, blood vessels, and blood. It transports oxygen and nutrients to the body cells and transports carbon dioxide and metabolic materials away from the body cells.

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delicate blood vessels that exist throughout your body, they transport blood, nutrients and oxygen to cells in your organs and body systems, capillaries are the smallest blood vessels in your vascular system

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the red liquid that circulates in the arteries and veins of humans and other vertebrate animals, carrying oxygen to and carbon dioxide from the tissues of the body

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any of the muscular-walled tubes forming part of the circulation system by which blood (mainly that which has been oxygenated) is conveyed from the heart to all parts of the body

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improper beating of the heart, whether irregular, too fast, or too slow

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one of four heart valves and is the final one encountered by oxygenated blood as it leaves the heart