Breathing and Exchange of Gases
Hold your breath and count. Somewhere between thirty seconds and a minute the urge to breathe becomes too strong to ignore. What is your body asking for, and how does the air reach every cell? In this chapter you follow a breath from the nostril to the alveolus, see how the chest makes the air move, read the volumes of a spirometer, and track oxygen and carbon dioxide through the blood. You also meet the part of the brain that decides how fast you breathe, and the diseases that damage the lungs. Python does the sums.
Part of Biology · High School (11–12) (chapter 12)
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The Respiratory System and the Mechanism of Breathing
How do a sponge, an earthworm, a fish and a human breathe? Here you learn the parts of the human respiratory system, the movements of the chest that pull air in and push it out, and the volumes of air that a spirometer measures.
Exchange of Gases and Transport of Oxygen
Why does oxygen move into the blood and carbon dioxide move out? You learn about partial pressure, the thin membrane of the alveolus, the part that haemoglobin plays in carrying oxygen, and how to read the oxygen dissociation curve.