As the pH of blood decreases, H+ ions increase, which combine with the protein part of hemoglobin to reduce its ability to bind with:
Correct answer: A. O2
- A. O2
- B. CO2
- C. CO
- D. H2
Explanation
If the pH of blood is lower than normal (normal physiological pH is 7.4), then the haemoglobin does not bind oxygen as well. In other words, the lower the pH, the more Hydrogen ions, the higher the carbon dioxide level and the LESS affinity Hemoglobin has for oxygen. The opposite is also true: the higher the pH lower the H+ ion concentration, the lower the carbon dioxide level, and the greater the affinity of haemoglobin for oxygen.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
Practise Respiration
446 free Respiration MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Gaseous Exchange in Lungs questions
All characteristics of Hemoglobin EXCEPT:
The given diagram shows the difference between the countercurrent and concurrent exchangesystem in fish:
What would be the site of the given reaction if it proceeds from right to left?CO2 + H2O⇌ H2CO3⇌ H+ + HCO-3
The venous blood in tissues has carbon dioxide:
The amount of oxygen in exhaled air is _.
Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs