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Synoptic Biology Essay - "The transport of oxygen from air in the alveoli of the lungs to the cytoplasm of respiring muscle cell".
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Synoptic Biology Essay "The transport of oxygen from air in the alveoli of the lungs to the cytoplasm of respiring muscle cell". (25) Oxygen is required all of the time for living cells to survive. Oxygen is inspired air is around 20%, in alveolar it is 13% and in expired air it is around 15%. Air is inspired by the vacuum effect of the thorax. The intercostals muscles contract pushing the ribs outwards and upwards, the diaphragm contracts and flattens. This increases the volume in the thoracic cavity and therefore the pressure decreases. This forces air into the lungs through the mouth. The lungs are a pair of gas exchange organs found in air-breathing vertebrates. The lungs are composed of air ducts (the trachea, bronchi and bronchioles) and alveoli, which provide a very large surface area for gas exchange with the blood. The lung capacity (total volume of air in the lungs)...
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