Respiratory System - Applications
Q. How does the diaphragm contribute to breathing?
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A.
By filtering air
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B.
By contracting and relaxing to change lung volume
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C.
By producing sound
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D.
By transporting oxygen
Solution
The diaphragm contracts and relaxes to change the volume of the thoracic cavity, facilitating inhalation and exhalation.
Correct Answer: B — By contracting and relaxing to change lung volume
Q. What is the primary function of the respiratory system in humans?
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A.
To circulate blood
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B.
To exchange gases
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C.
To digest food
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D.
To regulate temperature
Solution
The primary function of the respiratory system is to exchange gases, specifically oxygen and carbon dioxide, between the body and the environment.
Correct Answer: B — To exchange gases
Q. What is the primary purpose of the nasal cavity in the respiratory system?
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A.
To filter, warm, and humidify air
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B.
To exchange gases
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C.
To produce mucus
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D.
To regulate airflow
Solution
The nasal cavity filters, warms, and humidifies the air we breathe before it enters the lungs.
Correct Answer: A — To filter, warm, and humidify air
Q. What is the term for the process of breathing in?
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A.
Exhalation
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B.
Inhalation
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C.
Ventilation
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D.
Respiration
Solution
Inhalation is the process of taking air into the lungs, while exhalation is the process of breathing out.
Correct Answer: B — Inhalation
Q. What role do cilia play in the respiratory system?
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A.
They help in gas exchange
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B.
They trap and move particles out of the airways
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C.
They produce mucus
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D.
They regulate airflow
Solution
Cilia are hair-like structures that line the respiratory tract and help trap and move particles out of the airways, keeping the lungs clear of debris.
Correct Answer: B — They trap and move particles out of the airways
Q. Which gas is primarily responsible for stimulating the respiratory center in the brain?
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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 primarily stimulate the respiratory center in the brain to regulate breathing.
Correct Answer: B — Carbon dioxide
Q. Which part of the brain regulates the rate of breathing?
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A.
Cerebrum
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B.
Cerebellum
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C.
Medulla oblongata
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D.
Thalamus
Solution
The medulla oblongata is responsible for regulating the rate and depth of breathing based on the body's needs.
Correct Answer: C — Medulla oblongata
Q. Which respiratory condition is characterized by inflammation of the airways?
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A.
Asthma
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B.
Pneumonia
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C.
Bronchitis
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D.
Emphysema
Solution
Bronchitis is characterized by inflammation of the bronchial tubes, leading to coughing and difficulty breathing.
Correct Answer: C — Bronchitis
Q. Which structure in the respiratory system is responsible for the exchange of gases?
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A.
Trachea
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B.
Bronchi
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C.
Alveoli
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D.
Lungs
Solution
The alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs.
Correct Answer: C — Alveoli
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