NEET 2020
- Exam
- NEET
- Year
- 2020
- Subject
- Zoology
- Chapter
- Breathing and Exchange of Gases
NEET 2020 · Zoology · Breathing and Exchange of Gases
Identify the wrong statement with reference to transport of oxygen.
Identify the wrong statement with reference to transport of oxygen.
Options
- APartial pressure of CO2 can interfere with O2 binding with haemoglobin
- BHigher H+ conc. in alveoli favours the formation of oxyhaemoglobin
- CLow pCO2 in alveoli favours the formation of oxyhaemoglobin
- DBinding of oxygen with haemoglobin is mainly related to partial pressure of O2
Correct answer
B. Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin
Step-by-step solution
Body tissue obtains oxygen from oxyhaemoglobin because of its dissociation caused by low O2 and high CO2 concentration. Under a given concentration of oxygen in the blood, dissociation of oxyhaemoglobin will increase if the pH of the blood falls (increase in H+ concentration). When the partial pressure of CO2 rises (blood pH decreases), the dissociation curve of Oxyhaemoglobin at 37 °C shift to the right. Effect of high pCO2, high temperature and low pH are similar. p50 indicates the oxygen concentration at which 50% haemoglobin of blood is saturated with O2.