A table lists conditions of the blood. For each row, say whether it describes the tissue…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A table lists conditions of the blood. For each row, say whether it describes the tissue capillaries or the alveolar capillaries, and whether carbon dioxide binds to haemoglobin or comes off it.
- A high pCO and a low pO.
- A low pCO and a high pO.
- The reaction of carbon dioxide and water goes forward.
- The reaction of carbon dioxide and water goes backward.
- Bicarbonate is formed in large amounts.
Need a reminder? The key ideaShow
Carbon dioxide travels about per cent as bicarbonate, to per cent as carbamino-haemoglobin and about per cent dissolved. Carbonic anhydrase of the red blood cells makes go forward in the tissues and backward in the alveoli. Each mL of deoxygenated blood delivers about mL of carbon dioxide.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Tissue capillaries. Carbon dioxide binds to haemoglobin.
Step 2. (b) Alveolar capillaries. Carbon dioxide comes off haemoglobin.
Step 3. (c) Tissue capillaries, where the pCO is high.
Step 4. (d) Alveolar capillaries, where the pCO is low.
Step 5. (e) Tissue capillaries.
Answer: (a) tissues, binds; (b) alveoli, comes off; (c) tissues; (d) alveoli; (e) tissues.
Watch out. The two gases behave in opposite ways with haemoglobin in the same place. In the tissues oxygen comes off and carbon dioxide binds.
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