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.
Last updated
Read the Respiration notesFree MDCAT chapter notes with key terms446 questions · page 16 of 23
- A. Emphysema
- B. Asthma
- C. Lung cancer
- D. Bronchitis
Explanation: "The explanation for this question will be added soon!".
Correct answer: Lung cancer- A. Emphysema
- B. Lung cancer
- C. Tuberculosis
- D. Asthma
Explanation: Emphysema is the breakdown of Alveoli, hence inside of the lungs is damaged in emphysema.
Correct answer: Emphysema- A. 2
- B. 8
- C. 5
- D. More than 10
Explanation: Recent researches indicate that more than 10 compounds of tar of tobacco smoke are involv in causing cancer.
Correct answer: More than 10- A. 1 molecules of oxygen
- B. 2 molecules of oxygen
- C. 3 molecules of oxygen
- D. 4 molecules of oxygen
Explanation: One molecule of oxygen can bind to the iron atom of a heme group, giving each hemoglobin the ability to transport four oxygen molecules.
Correct answer: 4 molecules of oxygen- A. 1
- B. 2
- C. 3
- D. 4
Explanation: The nasal cavity is divided into three regions: the nasal vestibule, the nasal cavity proper or nasal fossa, and the olfactory region.
Correct answer: 3- A. 19.6ml/100 ml blood
- B. 25 ml/100 ml blood
- C. 30 ml/100 ml blood
- D. 20 ml/100 ml blood
Explanation: In 100 ml of blood, there is about 15 g of Hb, so that 100 ml of blood has the capacity to bind 20.1 ml of oxygen.
Correct answer: 20 ml/100 ml blood- A. Reduces friction between membranes
- B. Slide easily on one another
- C. Allows membrane to adhere on one another
- D. All of these are correct
Explanation: The pleural cavity aids optimal functioning of the lugs during breathing.
Correct answer: All of these are correct- A. Melanin
- B. Myoglobin
- C. Rhodopsin
- D. Lutein
Explanation: Myoglobin exhibits a higher affinity for oxygen than hemoglobin. Therefore, it is very efficient at extracting oxygen from the blood.
Correct answer: Myoglobin- A. Voice box
- B. Epiglottis
- C. Bronchi
- D. Windpipe
Explanation: The trachea is often called the windpipe. It's a key part of your respiratory system.
Correct answer: Windpipe- A. 10
- B. 11
- C. 12
- D. 13
Explanation: The ribs are the bony framework of the thoracic cavity. Generally, there are twelve pairs of ribs.
Correct answer: 12- A. Pharynx
- B. Larynx
- C. Glottis
- D. Nasal cavity
Explanation: The larynx is a cartilaginous segment of the respiratory tract located in the anterior aspect of the neck.
Correct answer: Larynx- A. Bronchioles
- B. Larynx
- C. Trachea
- D. Bronchi
Explanation: "The explanation for this question will be added soon!".
Correct answer: Bronchioles- A. 3.5 liters
- B. 2.5 liters
- C. 4 liters
- D. 5 liters
Explanation: Lung capacity or total lung capacity (TLC) is the volume of air in the lungs upon the maximum effort of inspiration.
Correct answer: 5 liters- A. Inhalation
- B. Exhalation
- C. Both and A and B
- D. Vocal waves
Explanation: Inhalation is a part of breathing where the air is taken into the lungs by creating negative pressure by the contraction of respiratory…
Correct answer: Both and A and B- A. Alveoli
- B. Trachea
- C. Bronchi
- D. None of these
Explanation: The diaphragm is a muscle that helps you inhale and exhale (breathe in and out).
Correct answer: None of these- A. Pharynx
- B. Diaphragm
- C. Bronchi
- D. None of these
Explanation: The diaphragm is a muscle that helps you inhale and exhale (breathe in and out).
Correct answer: Diaphragm- A. Intercostal muscles
- B. Ribs
- C. Both and A and B
- D. Diaphragm
Explanation: The diaphragm is a muscle that helps you inhale and exhale (breathe in and out).
Correct answer: Both and A and B- A. 11%
- B. 12%
- C. 15%
- D. 16%
Explanation: The amount gases in exhaled air are 4% to 5% by volume more carbon dioxide and 4% to 5% by volume less oxygen than was inhaled.
Correct answer: 16%- A. Ribs
- B. Pharynx
- C. Lungs
- D. Both B and C
Explanation: Intercostal muscles are muscles that present within the rib cage. Consist of three layers of muscles external, internal, and innermost…
Correct answer: Ribs- A. Decrease in Temperature
- B. Increase in pH
- C. Decrease in CO2 Concentration
- D. Decrease in pH
Explanation: "The explanation for this question will be added soon!".
Correct answer: Decrease in pH