25 Important Respiratory System MCQ Questions and Answers

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In which part of the respiratory system, gaseous exchange takes place?
(a) Alveoli
(c) Larynx
(b) Pharynx
(d) Trachea -
_____is located between two pleural sacs and is the central compartment of the thoracic cavity?
(a) Hilum
(b) Pleura
(c) Mediastinum
(d) Thoracic cage -
Which of the following statements is true about involuntary breathing?
(a) It is controlled by the bronchioles
(b) It is controlled by the pulmonary arterioles
(c) It is controlled by the alveolar-capillary network
(d) It is controlled by the neurons, located in the medulla and pons -
Which of the following are parts of the human respiratory system?
(a) Trachea
(b) Diaphragm
(c) The lungs
(d) All of the above -
Which of the following gas is released out during the process of respiration?
(a) Oxygen
(b) Hydrogen
(c) Carbon dioxide
(d) None of the above -
The tiny air sacs present man lungs are called
(a) Alveoli
(b) Bronchus
(c) Bronchioles
(d) All of the above -
Which of the following functions by filtering and keeping the mucus and dirt away from our lungs?
(a) Cilia
(b) Bronchioles
(c) Hairs in the lungs
(d) All of the above -
The total number of alveoli present in the human lungs is estimated to be around
(a) 1 billion
(b) 800 million
(c) 500 million
(d) 1500 million -
The exchange of gases between the external environment and the lungs
(a) Respiration
(b) External respiration
(c) Cellular respiration
(d) None of the above -
Which one of the following statements is false about the trachea?
(a) Has C-shaped rings
(b) It is covered by epiglottis
(c) It splits into the right and left lungs
(d) None of the above -
The maximum volume of air contained in the lung by a full forced inhalation is called
(a) Tidal volume
(b) Vital capacity
(c) Ventilation rate
(d) Total lung capacity -
Which one of the following is correct regarding the larynx?
(a) It houses the vocal cords
(b) It prevents the invading pathogens into the trachea
(c) It is an organ made of cartilage and connects the pharynx to the trachea
(d) All of the above -
Which of the following is the function of the trachea?
(a) Gaseous Exchange
(b) Filters the air we breathe
(c) Exhales the air from the body
(d) All of the above -
Which of these statements is true about internal respiration?
(a) Production of ATP
(b) Exchange of gases between the bloodstream and tissue cells
(c) Exchange of gases between alveoli and the bloodstream
(d) Breathing between the atmosphere and the alveoli -
Which of the following organs functions as an air conditioner?
(a) Larynx
(b) Pharynx
(c) Nasal chambers
(d) All of the above -
The gas which stimulates respiration is
(a) Nitrogen
(b) Oxygen
(c) Carbon dioxide -
The maximum amount of air that can be expired after the deepest inspiration is called
(a) Vital capacity
(b) Tidal volume
(c) Peak inspiratory volume -
Lecithin is a substance present in
(a) Oropharynx
(b) Bronchial tubes
(c) Alveoli -
Smoking is one of the causes of
(a) Hypoxia
(b) Emphysema
(c) Narcosis -
The most important factor in determining the percent oxygen saturation of hemoglobin is
(a) The partial pressure of O₂
(b) Acidity
(c) The partial pressure of CO₂ -
The internal lining of the trachea has a membrane of
(a) Ciliated endothelium
(b) Squamous epithelium
(c) Connective tissue cells
(d) Mucous cells -
The mediastinum is the name of
(a) Left lung
(b) Cartilage in the larynx
(c) Fold in between the Lungs
(d) Covering on the lungs -
During normal breathing, the amount of air that moves into the lungs and comes out is called
(a) IRV
(b) Residual volume
(c) ERV
(d) TV -
PO₂ stands for:
(a) Pure oxygen
(b) Partial oxygen
(c) Pressure of oxygen
(d) Partial pressure of oxygen -
Conchae are present in the
(a) Cardiac notch
(b) Voicebox
(c) Diaphragm
(d) Nasal cavity -
FAQ about Respiratory System
Read Frequently Asked Questions
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Covering the membrane of the lungs is
Pleura
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C-shaped cartilaginous rings are present in
Trachea, Bronchi and Bronchioles
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Difficulty in breathing is termed as
Dyspnoea
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The thyroid cartilage of the larynx is also called
Adams’ Apple
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A deficiency of oxygen at the tissue level is called
Hypoxia
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Above normal partial pressure of CO₂ is called
Hypercapnia
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Rapid and deep breathing is called
Hyperventilation
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The total volume of air inhaled and exhaled each minute is called
Minute Ventilation
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The volume of air in one breath is called
Tidal Volume
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The amount of air exhaled in forced exhalation is called
Expiratory Reserve Volume (ERV)
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The respiratory organs are
Nose, Pharynx, Larynx, Trachea, Bronchi, Bronchioles, and Lungs
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The internal portion of the nose communicates with the nasopharynx through the
Internal Nares
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The anterior part of the nasal cavity is called the
Vestibule
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Three anatomic regions of the pharynx are
Nasopharynx, Oropharynx, and Laryngopharynx
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The cartilage which connects the larynx and trachea is called the
Cricoid Cartilage
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