Biology
Respiration and Gas Exchange
958 Questions
Access a targeted set of questions on respiration and gas exchange for competitive exams. Topics include lung volumes, the mechanism of breathing, and respiratory anatomy. Understanding these physiological processes is essential for scoring well.
Lung volumes and capacitiesBreathing mechanismsRespiratory anatomyGas exchange processes
Respiration and Gas Exchange Questions
A
Correct answer
Explanation
Coughing and breathlessness are classic symptoms of respiratory distress, which indicates an infection in the lungs. Other organs do not typically present with these specific respiratory symptoms.
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base
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trachea
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mediastinum
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hilum
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apex
D
Correct answer
Explanation
The hilum of the lung is a triangular part which allows the other structures forming the root of the lung to enter and exit. It permits arteries, veins, nerves, bronchi and other structures to enter and exit.
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eating
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sleeping
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playing football
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none of these
B
Correct answer
Explanation
Sleep is a period of reduced activity. Sleep is associated with a typical posture, such as lying down with eyes closed in humans. Sleep results in a decreased responsiveness to external stimuli.
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Gills
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Skin
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Trachea�
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Fins
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too much oxygen in the blood
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too much CO2 in the blood
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very little CO2 in the blood
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both too much O2 and very little CO2 in the blood
D
Correct answer
Explanation
Forced breathing (hyperventilation) lowers the partial pressure of CO2 in the blood. Since CO2 is the primary chemical stimulus for the respiratory center, its reduction leads to a temporary cessation of breathing (apnea) until levels rise again.
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the total maximum air that can be drawn into lungs
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the air that normally goes in and comes out of the lungs during breathing
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the air that is left in the lungs after normal expiration
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the air that can be expelled out forcibly after the normal expiration
B
Correct answer
Explanation
Tidal volume is defined as the volume of air inspired or expired during a normal, quiet breath.
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Trachea
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Nasal passage
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Bronchi
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None of these.
B
Correct answer
Explanation
The nasal passage is the primary cavity located directly behind the nostrils, serving as the first part of the respiratory tract.
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Trachea
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Bronchi
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Lungs
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All of the above
D
Correct answer
Explanation
The human respiratory system consists of several interconnected organs, including the trachea, bronchi, and lungs, which work together to facilitate gas exchange.
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Air Pipe
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Wind Pipe
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Vacuum Pipe
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None of these
B
Correct answer
Explanation
The trachea is a cartilaginous tube that connects the larynx to the bronchi, commonly referred to as the windpipe.
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Diaphragm
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Ribs
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Alveoli
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All of the above
A
Correct answer
Explanation
The diaphragm is a dome-shaped sheet of muscle that separates the thoracic cavity, containing the lungs, from the abdominal cavity.
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Diaphragm
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Ribs
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Alveoli
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All of the above
B
Correct answer
Explanation
The rib cage is a bony structure that protects the thoracic organs, including the lungs and heart.
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Bronchioles
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Ribs
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Alveoli
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All of the above
C
Correct answer
Explanation
Alveoli are tiny, balloon-like air sacs at the end of the bronchioles where gas exchange occurs in the lungs.
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bronchi
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larynx
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pleura
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none of these
C
Correct answer
Explanation
The lungs are protected by a double-layered serous membrane called the pleura, which reduces friction during breathing.
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bronchioles
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ribs
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alveoli
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All of the above
A
Correct answer
Explanation
Inside the lungs, the bronchi branch into smaller tubes called bronchioles, which eventually terminate in the alveoli.
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very thin capillaries
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water capillaries
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no capillaries
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none of these
A
Correct answer
Explanation
Alveoli are surrounded by a dense network of pulmonary capillaries to facilitate the exchange of oxygen and carbon dioxide.