25 Important Respiratory System MCQ Questions and Answers

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 cageWhich 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 ponsWhich of the following are parts of the human respiratory system?
(a) Trachea
(b) Diaphragm
(c) The lungs
(d) All of the aboveWhich of the following gas is released out during the process of respiration?
(a) Oxygen
(b) Hydrogen
(c) Carbon dioxide
(d) None of the aboveThe tiny air sacs present man lungs are called
(a) Alveoli
(b) Bronchus
(c) Bronchioles
(d) All of the aboveWhich 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 aboveThe 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 millionThe exchange of gases between the external environment and the lungs
(a) Respiration
(b) External respiration
(c) Cellular respiration
(d) None of the aboveWhich 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 aboveThe 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 capacityWhich 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 aboveWhich 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 aboveWhich 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 alveoliWhich of the following organs functions as an air conditioner?
(a) Larynx
(b) Pharynx
(c) Nasal chambers
(d) All of the aboveThe gas which stimulates respiration is
(a) Nitrogen
(b) Oxygen
(c) Carbon dioxideThe maximum amount of air that can be expired after the deepest inspiration is called
(a) Vital capacity
(b) Tidal volume
(c) Peak inspiratory volumeLecithin is a substance present in
(a) Oropharynx
(b) Bronchial tubes
(c) AlveoliSmoking is one of the causes of
(a) Hypoxia
(b) Emphysema
(c) NarcosisThe most important factor in determining the percent oxygen saturation of hemoglobin is
(a) The partial pressure of Oโ
(b) Acidity
(c) The partial pressure of COโThe internal lining of the trachea has a membrane of
(a) Ciliated endothelium
(b) Squamous epithelium
(c) Connective tissue cells
(d) Mucous cellsThe mediastinum is the name of
(a) Left lung
(b) Cartilage in the larynx
(c) Fold in between the Lungs
(d) Covering on the lungsDuring normal breathing, the amount of air that moves into the lungs and comes out is called
(a) IRV
(b) Residual volume
(c) ERV
(d) TVPOโ stands for:
(a) Pure oxygen
(b) Partial oxygen
(c) Pressure of oxygen
(d) Partial pressure of oxygenConchae are present in the
(a) Cardiac notch
(b) Voicebox
(c) Diaphragm
(d) Nasal cavityFAQ about Respiratory System
Read Frequently Asked Questions
Covering the membrane of the lungs is
Pleura
C-shaped cartilaginous rings are present in
Trachea, Bronchi and Bronchioles
Difficulty in breathing is termed as
Dyspnoea
The thyroid cartilage of the larynx is also called
Adamsโ Apple
A deficiency of oxygen at the tissue level is called
Hypoxia
Above normal partial pressure of COโ is called
Hypercapnia
Rapid and deep breathing is called
Hyperventilation
The total volume of air inhaled and exhaled each minute is called
Minute Ventilation
The volume of air in one breath is called
Tidal Volume
The amount of air exhaled in forced exhalation is called
Expiratory Reserve Volume (ERV)
The respiratory organs are
Nose, Pharynx, Larynx, Trachea, Bronchi, Bronchioles, and Lungs
The internal portion of the nose communicates with the nasopharynx through the
Internal Nares
The anterior part of the nasal cavity is called the
Vestibule
Three anatomic regions of the pharynx are
Nasopharynx, Oropharynx, and Laryngopharynx
The cartilage which connects the larynx and trachea is called the
Cricoid Cartilage
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