9700 · 8.2
Transport of oxygen and carbon dioxide
Ever wondered how your body efficiently moves essential gases around? The **circulatory system** is a master of logistics, ensuring every cell gets the vital **oxygen** it needs and metabolic waste **carbon dioxide** is swiftly removed. This lesson dives deep into the fascinating mechanisms that make this vital transport possible, focusing on the star molecule: **haemoglobin**. Key points align with **A-Level Notes** 9700 Biology chapter **8** (topic **8.2**). Notes and diagrams from **A-Level Notes** chapter **8**, topic **8.2** (4 pages).
Need to know
What you need to know
- The S-shaped curve demonstrates cooperative binding of oxygen to haemoglobin.
- High pO₂ in the lungs (13.3 kPa) results in high haemoglobin saturation.
- Low pO₂ in the tissues (e.g., 5.3 kPa) causes significant oxygen release.
- The steep part of the curve ensures efficient oxygen unloading to active tissues.
Explanation
Transport of oxygen and carbon dioxide
- The S-shaped curve demonstrates cooperative binding of oxygen to haemoglobin.
- High pO₂ in the lungs (13.3 kPa) results in high haemoglobin saturation.
- Low pO₂ in the tissues (e.g., 5.3 kPa) causes significant oxygen release.
- The steep part of the curve ensures efficient oxygen unloading to active tissues.