In humans exchange of gases mainly occurs in which structure of lungs?
Answer and explanation
Correct answer: Alveoli
Gas exchange in human lungs takes place mainly in the alveoli, millions of tiny balloon-like air sacs at the ends of bronchioles. Their walls are only one cell thick and are closely surrounded by blood capillaries, giving oxygen a short diffusion path into blood and carbon dioxide a path out. The stomach and small intestine digest food, while the heart pumps blood, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
Alveoli
Why is this the correct answer?
Gas exchange in human lungs takes place mainly in the alveoli, millions of tiny balloon-like air sacs at the ends of bronchioles. Their walls are only one cell thick and are closely surrounded by blood capillaries, giving oxygen a short diffusion path into blood and carbon dioxide a path out. The stomach and small intestine digest food, while the heart pumps blood, so option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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