Which gas exchange occurs in the alveoli?
Answer and explanation
Correct answer: B. Oxygen enters blood and carbon dioxide leaves
- Step 1: Gas exchange occurs by diffusion across the alveolar wall. Answer: Oxygen enters blood and carbon dioxide leaves. Why not the others: Nitrogen enters blood and oxygen leaves, Carbon dioxide enters blood and oxygen leaves and Hydrogen enters blood and nitrogen leaves don't fit.
Practise more Human physiology.
Free questions with an explanation for every one, and full timed Medical Entrance Exam (University of Iceland) mock tests.
More Human physiology questions
- Which chamber of the heart pumps oxygenated blood to the body?
- Which vessel carries oxygenated blood from the lungs to the heart?
- Which valve lies between the left atrium and the left ventricle?
- Which part of the heart acts as the natural pacemaker?
- Which hormone increases blood pressure by promoting sodium retention in the kidney?
- Which blood cells carry oxygen?