Free Respiration MCQs with Answers
446 Respiration MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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Read the Respiration notesFree MDCAT chapter notes with key terms446 questions · page 10 of 23
- A. Chemical process
- B. Biochemical process
- C. Mechanical process
- D. Both A and B
Explanation: Breathing is a mechanical process and it is a surface phenomenon.
Correct answer: Mechanical process- A. Emphysema
- B. Asthma
- C. Pneumonia
- D. Bronchitis
Explanation: Emphysema is one of the diseases that comprises COPD (chronic obstructive pulmonary disease).
Correct answer: Pneumonia- A. Alveoli
- B. Trachea
- C. Bronchiole
- D. Bronchus
Explanation: Option A: Lungs are the organs of ventilation in terrestrial animals. In humans, nostrils lead to the trachea or windpipe through the…
Correct answer: Alveoli- A. Lungs
- B. Alveoli
- C. Windpipe
- D. Alveolar duct
Explanation: The respiratory surface is the actual surface where the exchange of gases actually takes place.
Correct answer: Alveoli- A. Coronary heart disease
- B. Bronchitis
- C. Emphysema
- D. Asthma
Explanation: In emphysema, the inner walls of the lungs' air sacs (alveoli) are damaged, causing them to eventually rupture.
Correct answer: Emphysema- A. Myoglobin and Haemoglobin has higher affinity for nitrogen
- B. Cyanide and Haemoglobin has a low affinity for oxygen
- C. Myoglobin has more affinity for oxygen as compared to haemoglobin
- D. Albumin, Globulin and Globin proteins are present in respiratory pigments
Explanation: Myoglobin's affinity for oxygen is higher than haemoglobin. And unlike haemoglobin which is found in the red blood cells, myoglobin is…
Correct answer: Myoglobin has more affinity for oxygen as compared to haemoglobin- A. Efficient gas exchange
- B. Both A and C
- C. Maintaining structural integrity of alveoli
- D. None of these
Explanation: Lung surfactant is a complex with a unique phospholipid and protein composition.
Correct answer: Both A and C- A. Bronchi
- B. Bronchioles
- C. Pharynx duct
- D. Alveoli
Explanation: "The explanation for this question will be added soon!".
Correct answer: Alveoli- A. Acute bronchitis
- B. Chronic bronchitis
- C. Coastal bronchitis
- D. Intercostal bronchitis
Explanation: 'Acute bronchitis' is a contagious viral infection that causes inflammation of the bronchial tubes - these are the airways that carry air…
Correct answer: Acute bronchitis- A. Lungs
- B. Gills
- C. Bladder
- D. Trachea
Explanation: The bladder is not directly associated with the process of respiration.
Correct answer: Bladder- A. The lungs get inflated
- B. The man dies as the lungs collapse
- C. The breathing rate decreases
- D. The breathing rate increases
Explanation: This would eventually lead to the damage of pleural membrane which in turn would disrupt the pressure balance of gases, which would lead…
Correct answer: The man dies as the lungs collapse- A. Voice box
- B. Epiglottis
- C. Bronchi
- D. Windpipe
Explanation: The trachea is also known as the windpipe as it carries air from the larynx to the bronchi so the correct answer is Option D.
Correct answer: Windpipe- A. Melanin
- B. Myoglobin
- C. Rhodopsin
- D. Lutein
Explanation: Myoglobin is a protein primarily located in the striated muscle hence it is known as the muscle hemoglobin.
Correct answer: Myoglobin- A. Rise in pH of guard cells causes hydrolysis of starch.
- B. Cytokinins and cAMP are required.
- C. Absicisic acid promotes closure.
- D. All of the above.
Explanation: Correct option is D. Abscisic acid (ABA) stimulates closure of stomata in the epidermal tissue of the leaves.
Correct answer: All of the above.- A. Both glottis and voice box
- B. Bronchi
- C. Glottis
- D. Voice box
Explanation: The glottis and voice box (larynx) are intermediates between the trachea and pharynx.
Correct answer: Both glottis and voice box196. Glottis is lined by?
- A. Plasma membrane
- B. Epithelial membrane
- C. Meninges
- D. Mucous membrane
Explanation: Glottis is part of the upper respiratory tract and so, is lined by mucous membranes.
Correct answer: Mucous membrane- A. Carbaminohemoglobin
- B. Protein
- C. Micelles
- D. Cholestrol
Explanation: When carbon dioxide binds to hemoglobin, a molecule called carbaminohemoglobin is formed. Option B,C and D are incorrect
Correct answer: Carbaminohemoglobin- A. Asthma
- B. Tuberculosis
- C. Emphysema
- D. A and B
Explanation: Emphysema is one of the diseases that comprises COPD (chronic obstructive pulmonary disease).
Correct answer: Emphysema- A. 2
- B. 5
- C. 8
- D. More than 10
Explanation: The correct answer is "D". Tobacco smoke is made up of thousands of chemicals, including at least 70 known to cause cancer.
Correct answer: More than 10- A. 19.6ml/100 ml blood
- B. 20 ml/100 ml blood
- C. 25 ml/100 ml blood
- D. 30 ml/100 ml blood
Explanation: The maximum amount of oxygen which normal human blood absorbs and carries at sea-level is about 20ml/100 ml of blood.
Correct answer: 20 ml/100 ml blood