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The Circulatory System

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Gavin Hill

on 29 April 2016

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Transcript of The Circulatory System

The Heart
The voyage of a red blood cell begins in the heart. The deoxygenated blood enters the right atrium and then the right ventricle. The pulmonary artery carries this blood to the lungs.
The Lungs
The deoxygenated blood goes through the capillaries of the lungs, where carbon dioxide is filtered out, and oxygen is picked up in the alveoli. The red blood cell is now oxygenated. This is called pulmonary circulation.
Back to the Heart
The oxygenated blood now travels back to the heart through the pulmonary veins. It enters the left atrium, and then the left ventricle.
The Body
The red blood cell now travels throughout the body, where it delivers oxygen to the cells and picks up carbon dioxide waste using a protein called hemoglobin. This carbon dioxide is a product of cellular respiration. This circulation from the heart to the body is called systemic circulation.
Back to the Heart
At this point the deoxygenated blood returns to the heart and the process starts over again.
The Circulatory System
Composition of Blood
In addition to red blood cells there are several other significant components of blood. The largest percentage (55%) is made up of plasma. This is a liquid that is important to homeostasis.
Platelets are small fragments of cells that are pinched off pieces of larger cells in the bone marrow. They are a a vital component in the process of blood clotting.
White blood cells are produced in bone marrow and help fight infection.
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