Gas exchange in tissues and lungs

In this topic

• The three stages of breathing
• Diffusion — the single mechanism
• Gas exchange in the lungs and the transport of gases
• Gas exchange in the tissues and cellular respiration

Key terms

• Gas exchange
• External respiration
• Internal (tissue) respiration
• Cellular respiration
• Diffusion
• Partial pressure
• Alveolus
• Oxyhaemoglobin
• Carbhaemoglobin
• Bicarbonate salts
• Arterial blood
• Venous blood

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