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Assertion: Alveoli are the primary sites for exchange of gases.
Reason: All factors in our body are favourable for diffusion of O2 from alveoli to tissues and that of CO2 from tissues to alveoli.
  • a)
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  • b)
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  • c)
    If Assertion is true but Reason is false.
  • d)
    If both Assertion and Reason are false.
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Assertion: Alveoli are the primary sites for exchange of gases.Reason:...
The solubility of the gases as well as the thickness of the membranes involved in diffusion are important factors that affect the rate of diffusion. A gradient of partial pressure is present for oxygen from alveoli to blood and blood to tissue. Similarly, a gradient of CO2 is present in the opposite direction i.e., from tissues to blood and blood to alveoli. The pO2 in alveoli is higher (104 mm Hg) than that in deoxygenated blood in the capillaries arising from pulmonary arteries (95 mm Hg), therefore, oxygen diffuses from the alveoli to the blood. Similarly, the partial pressure of carbon dioxide (pCO2) is higher in deoxygenated blood (45 mm Hg) than that in alveoli (40 mm Hg), therefore carbon dioxide passes from the blood to the alveoli. It is further dependent on the solubility of the diffusing gases. As the solubility of CO2 is 20-25 times higher than that of O2, the amount of CO2 that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O2. Therefore, all the factors in our body are favourable for diffusion of O2 from alveoli to tissues and that of CO2 from tissues to alveoli. Alveolus is the primary site of exchange as it has an extensive network of blood capillaries and consists of squamous epithelium. Due to very intimate conact of blood capillaries with the alveoli, the exchange of gases takes place easily.
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Assertion: Alveoli are the primary sites for exchange of gases.Reason: All factors in our body are favourable for diffusion of O2 from alveoli to tissues and that of CO2 from tissues to alveoli.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion.b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.c)If Assertion is true but Reason is false.d)If both Assertion and Reason are false.Correct answer is option 'B'. Can you explain this answer?
Question Description
Assertion: Alveoli are the primary sites for exchange of gases.Reason: All factors in our body are favourable for diffusion of O2 from alveoli to tissues and that of CO2 from tissues to alveoli.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion.b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.c)If Assertion is true but Reason is false.d)If both Assertion and Reason are false.Correct answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Assertion: Alveoli are the primary sites for exchange of gases.Reason: All factors in our body are favourable for diffusion of O2 from alveoli to tissues and that of CO2 from tissues to alveoli.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion.b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.c)If Assertion is true but Reason is false.d)If both Assertion and Reason are false.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion: Alveoli are the primary sites for exchange of gases.Reason: All factors in our body are favourable for diffusion of O2 from alveoli to tissues and that of CO2 from tissues to alveoli.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion.b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.c)If Assertion is true but Reason is false.d)If both Assertion and Reason are false.Correct answer is option 'B'. Can you explain this answer?.
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