Free Gaseous Exchange in Lungs MCQs with Answers
12 Gaseous Exchange in Lungs MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
12 questions · page 2 of 2
11. Hemoglobin has highest affinity for O2 when
- A. pH is low
- B. CO2 is high
- C. pH is high
- D. Temperature is high
Explanation: Hemoglobin has highest O2 affinity at high pH, low CO2, and low temperature (in the lungs).
Correct answer: pH is high12. The chloride shift occurs to
- A. Maintain electrical neutrality
- B. Increase O2 transport
- C. Decrease CO2
- D. Activate enzymes
Explanation: As HCO3- leaves RBCs, Cl- enters to maintain electrical neutrality (chloride shift or Hamburger shift).
Correct answer: Maintain electrical neutrality