Respiratory System - Competitive Exam Level
Q. What is the term for the exchange of gases between the blood and body tissues?
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A.
External respiration
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B.
Internal respiration
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C.
Cellular respiration
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D.
Pulmonary ventilation
Solution
Internal respiration refers to the exchange of gases between the blood and the tissues of the body.
Correct Answer: B — Internal respiration
Q. Which gas is primarily responsible for stimulating the respiratory center?
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A.
Oxygen
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B.
Carbon dioxide
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C.
Nitrogen
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D.
Hydrogen
Solution
Carbon dioxide levels in the blood are the primary stimulus for the respiratory center to increase breathing rate.
Correct Answer: B — Carbon dioxide
Q. Which of the following structures is NOT part of the upper respiratory tract?
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A.
Nasal cavity
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B.
Pharynx
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C.
Larynx
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D.
Bronchi
Solution
The bronchi are part of the lower respiratory tract, while the nasal cavity, pharynx, and larynx are part of the upper respiratory tract.
Correct Answer: D — Bronchi
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