All characteristics of Hemoglobin EXCEPT:
Correct answer: B. Loses oxygen at PO2 60mmHg
- A. Has more affinity with oxygen
- B. Loses oxygen at PO2 60mmHg
- C. Transports oxygen
- D. Has four iron atoms in molecule
Explanation
Hemoglobin indeed releases oxygen to tissues when the partial pressure of oxygen (PO2) decreases, which typically happens around 40 mmHg or lower, not specifically at 60 mmHg. This phenomenon is part of the oxygen-hemoglobin dissociation curve.
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
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
Skin is kept moist by the secretion of epidermal mucous gland cells and coelomic fluid.The given characteristic feature is a common respiratory adaptation in
As the pH of blood decreases, H+ ions increase, which combine with the protein part of hemoglobin to reduce its ability to bind with:
The venous blood in tissues has carbon dioxide:
The amount of oxygen in exhaled air is _.