The Respiratory System
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- The main organs in the respiratory system: the nose, mouth, pharynx, epiglottis, trachea, bronchial tubes, lungs and diaphragm.
- Air enters the nostrils and mouth if it is open then goes into the pharynx then passes by the epiglottis. The epiglottis stops food and water from going down into your lungs.
- The air goes down into the trachea and then splits into your two bronchial tubes that feed into your bronchioles, which brings air to your alveoli.
- The lungs give unoxygenated blood oxygen. Then they send the carbon dioxide back out the nostrils or the mouth.
- When the diaphragm contracts, the lungs expand and let air in but when it relaxes the lungs shrink.
- The gas exchange transfers oxygen from the lungs to the bloodstream during gas exchange. Carbon dioxide is transported from the bloodstream to the lungs at the same time. This occurs in the lungs, between the alveoli and a network of microscopic blood vessels known as capillaries, which are found in the alveoli's walls.
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