The ____ that give our lungs huge surface area for absorbing oxygen from the air.
4. The (a) _____ is the body system that transports blood and other materials. It brings vital supplies to the cells and carries away their (b) _____.
4. The (a) _____ is the body system that transports blood and other materials. It brings vital supplies to the cells and carries away their (b) _____.
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The alveoli or the air sacs are the functional units of the lungs that provides the lungs huge surface are for the absorption of oxygen from the air and the release of carbon dioxide for expiration. Air passes through the nasal cavity, the pharynx, the trachea, the bronchi, and finally through the bronchioles and the trip terminates at the alveoli.
The circulatory system is composed of blood vessels, the heart, and blood. Blood circulates throughout the body because of the force generated by each pump of the heart. As unoxygenated blood passes through the heart, it gets pumped to the lungs where it releases carbon dioxide and takes in oxygen. The oxygenated blood then goes back to the heart where it gets pumped to distribute the life-giving gas to the cells. Blood then takes away the cellular waste products such as carbon dioxide to be disposed off elsewhere in the body.
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