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Which of the following statement(s) is (are) true about respiration ?
(i) During exhalation, ribs move inwards and diaphragm is lowered.
(ii) Exchange of gases takes place in alveoli.
(iii) During inhalation, ribs move outwards and diaphragm is lowered.
(iv) Haemoglobin has greater affinity for carbon dioxide.
(i) During exhalation, ribs move inwards and diaphragm is lowered.
(ii) Exchange of gases takes place in alveoli.
(iii) During inhalation, ribs move outwards and diaphragm is lowered.
(iv) Haemoglobin has greater affinity for carbon dioxide.
- a)(i) and (ii)
- b)(ii) and (iii)
- c)(i) and (iv)
- d)(iii) and (iv)
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Which of the following statement(s) is (are) true about respiration ?(...
During inhalation, diaphragm is lowered and ribs move outward resulting in increased volume of lungs so air rushes in. Exchange of gases occur in alveoli.
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Which of the following statement(s) is (are) true about respiration ?(...
Statement (i): During exhalation, ribs move inwards and diaphragm is lowered.
Statement (ii): Exchange of gases takes place in alveoli.
Statement (iii): During inhalation, ribs move outwards and diaphragm is lowered.
Statement (iv): Haemoglobin has greater affinity for carbon dioxide.
Explanation:
Respiration is the process by which organisms obtain oxygen from the environment and release carbon dioxide as a waste product. It involves two main processes: inhalation (breathing in) and exhalation (breathing out). Let's analyze each statement to determine their accuracy:
Statement (i): During exhalation, ribs move inwards and diaphragm is lowered.
During exhalation, the ribs move downwards and inwards, while the diaphragm relaxes and moves upwards. This reduces the volume of the thoracic cavity, increasing the pressure inside the lungs. As a result, air is forced out of the lungs. This statement is incorrect.
Statement (ii): Exchange of gases takes place in alveoli.
The exchange of gases between the respiratory surface and the blood occurs in the alveoli. Alveoli are tiny, balloon-like structures present in the lungs where oxygen from the inhaled air diffuses into the bloodstream, and carbon dioxide, a waste product, diffuses from the bloodstream into the alveoli to be exhaled. This statement is correct.
Statement (iii): During inhalation, ribs move outwards and diaphragm is lowered.
During inhalation, the ribs move upwards and outwards, while the diaphragm contracts and moves downwards. This increases the volume of the thoracic cavity, decreasing the pressure inside the lungs. As a result, air is drawn into the lungs. This statement is correct.
Statement (iv): Haemoglobin has greater affinity for carbon dioxide.
Haemoglobin has a greater affinity for oxygen than for carbon dioxide. It binds to oxygen in the lungs, forming oxyhemoglobin, and releases oxygen in the tissues, allowing for cellular respiration. Carbon dioxide, on the other hand, is transported in the blood mainly in the form of bicarbonate ions. This statement is incorrect.
Therefore, the correct statements are (ii) Exchange of gases takes place in alveoli and (iii) During inhalation, ribs move outwards and diaphragm is lowered. The correct answer is option B.
Statement (ii): Exchange of gases takes place in alveoli.
Statement (iii): During inhalation, ribs move outwards and diaphragm is lowered.
Statement (iv): Haemoglobin has greater affinity for carbon dioxide.
Explanation:
Respiration is the process by which organisms obtain oxygen from the environment and release carbon dioxide as a waste product. It involves two main processes: inhalation (breathing in) and exhalation (breathing out). Let's analyze each statement to determine their accuracy:
Statement (i): During exhalation, ribs move inwards and diaphragm is lowered.
During exhalation, the ribs move downwards and inwards, while the diaphragm relaxes and moves upwards. This reduces the volume of the thoracic cavity, increasing the pressure inside the lungs. As a result, air is forced out of the lungs. This statement is incorrect.
Statement (ii): Exchange of gases takes place in alveoli.
The exchange of gases between the respiratory surface and the blood occurs in the alveoli. Alveoli are tiny, balloon-like structures present in the lungs where oxygen from the inhaled air diffuses into the bloodstream, and carbon dioxide, a waste product, diffuses from the bloodstream into the alveoli to be exhaled. This statement is correct.
Statement (iii): During inhalation, ribs move outwards and diaphragm is lowered.
During inhalation, the ribs move upwards and outwards, while the diaphragm contracts and moves downwards. This increases the volume of the thoracic cavity, decreasing the pressure inside the lungs. As a result, air is drawn into the lungs. This statement is correct.
Statement (iv): Haemoglobin has greater affinity for carbon dioxide.
Haemoglobin has a greater affinity for oxygen than for carbon dioxide. It binds to oxygen in the lungs, forming oxyhemoglobin, and releases oxygen in the tissues, allowing for cellular respiration. Carbon dioxide, on the other hand, is transported in the blood mainly in the form of bicarbonate ions. This statement is incorrect.
Therefore, the correct statements are (ii) Exchange of gases takes place in alveoli and (iii) During inhalation, ribs move outwards and diaphragm is lowered. The correct answer is option B.
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Which of the following statement(s) is (are) true about respiration ?(...
Correct answer is option b...
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Which of the following statement(s) is (are) true about respiration ?(i)During exhalation, ribs move inwards and diaphragm is lowered.(ii)Exchange of gases takes place in alveoli.(iii) During inhalation, ribs move outwards and diaphragm is lowered.(iv) Haemoglobin has greater affinity for carbon dioxide.a)(i) and (ii)b)(ii) and (iii)c)(i) and (iv)d)(iii) and (iv)Correct answer is option 'B'. Can you explain this answer?
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