Cardiovascular System Anatomy
Take a Tour Now. Retrieved 27 March The largest arteries of the body contain a high percentage of elastic tissue that allows them to stretch and accommodate the pressure of the heart. Body Glove Water Filter Systems. At Hampshire Cosmetics we have extensive experience of hair care and styling. Even at rest, the average heart easily pumps over 5 liters of blood throughout the body every minute.
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The left and right coronary arteries branch off from the aorta and provide blood to the left and right sides of the heart. The coronary sinus is a vein on the posterior side of the heart that returns deoxygenated blood from the myocardium to the vena cava. The veins of the stomach and intestines perform a unique function: Blood leaving the digestive organs is rich in nutrients and other chemicals absorbed from food.
The liver removes toxins, stores sugars, and processes the products of digestion before they reach the other body tissues. Blood from the liver then returns to the heart through the inferior vena cava. The average human body contains about 4 to 5 liters of blood. As a liquid connective tissue, it transports many substances through the body and helps to maintain homeostasis of nutrients, wastes, and gases.
Blood is made up of red blood cells, white blood cells, platelets, and liquid plasma. Erythrocytes are produced inside of red bone marrow from stem cells at the astonishing rate of about 2 million cells every second. The shape of erythrocytes is biconcave—disks with a concave curve on both sides of the disk so that the center of an erythrocyte is its thinnest part.
The unique shape of erythrocytes gives these cells a high surface area to volume ratio and allows them to fold to fit into thin capillaries. Immature erythrocytes have a nucleus that is ejected from the cell when it reaches maturity to provide it with its unique shape and flexibility. The lack of a nucleus means that red blood cells contain no DNA and are not able to repair themselves once damaged. Erythrocytes transport oxygen in the blood through the red pigment hemoglobin.
Hemoglobin contains iron and proteins joined to greatly increase the oxygen carrying capacity of erythrocytes. The high surface area to volume ratio of erythrocytes allows oxygen to be easily transferred into the cell in the lungs and out of the cell in the capillaries of the systemic tissues. There are two major classes of white blood cells: Also known as thrombocytes, platelets are small cell fragments responsible for the clotting of blood and the formation of scabs.
Platelets form in the red bone marrow from large megakaryocyte cells that periodically rupture and release thousands of pieces of membrane that become the platelets.
Platelets do not contain a nucleus and only survive in the body for up to a week before macrophages capture and digest them. Plasma is a mixture of water, proteins, and dissolved substances. The proteins within plasma include antibodies and albumins. Antibodies are part of the immune system and bind to antigens on the surface of pathogens that infect the body.
Many different substances can be found dissolved in the plasma, including glucose, oxygen, carbon dioxide, electrolytes, nutrients, and cellular waste products. The plasma functions as a transportation medium for these substances as they move throughout the body. The cardiovascular system has three major functions: Many serious conditions and diseases can cause our cardiovascular system to stop working properly.
Browse our content to learn more about cardiovascular health. Also, explore how DNA health testing can allow you to begin important conversations with your doctor about genetic risks for disorders involving clotting, hemophilia, hemochromatosis a common hereditary disorder causing iron to accumulate in the heart and glucosephosphate dehydrogenase which affects about 1 in 10 African American men.
The left and right sides of the heart are separated by a muscular wall of tissue known as the septum of the heart. The right side of the heart receives deoxygenated blood from the systemic veins and pumps it to the lungs for oxygenation. Car Body kits really make the car yours by taking your design preferences and applying it to the styling of the exterior of your car.
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