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 19 of 23
- A. Indicted
- B. Battered
- C. Vindicated
- D. Destitute
Explanation: The best answer is C. "Vindicated" means "cleared of suspicion or doubt" and "authenticated" means "proved to be genuine." The rest of the…
Correct answer: Vindicated- A. and
- B. His
- C. lately
- D. I
Explanation: The error in the sentence is in option (D) "I." It should be corrected to "me" to maintain correct grammar and syntax.
Correct answer: I- A. Only conclusion I follows
- B. Only conclusion II follows
- C. Either I or II follows
- D. Neither I nor II follows
- E. Both I and II follow
Explanation: According to the statement, funding is necessary to improve quality and Pakistan is allocating funds to education.
Correct answer: Only conclusion I follows- A. 1
- B. 2
- C. 3
- D. 4
Explanation: Multiplying the digits of each number gives: 9×7×2=126; 9×3×8=216; 8×9×5=360; 8×6×3=144; 6×9×2=108; 5×3×6=90.
Correct answer: 4- A. Saeed
- B. Kashif
- C. C. Ghafoor
- D. D. Rizwan
Explanation: By combining the information, we can see that Ghafoor is listed as being good at cricket and volleyball, and also at football and…
Correct answer: C. Ghafoor- A. Statement I is the cause and statement II is its effect
- B. Statement II is the cause, and statement I is its effect
- C. Both the statements I and II are independent causes
- D. Both the statements I and II are effects of independent causes
Explanation: "Closing the schools for a week and the parents withdrawing their wards from the local schools are independent issues", which must have…
Correct answer: Both the statements I and II are effects of independent causes- A. Relaxes and domes up
- B. Contracts and flattens
- C. Remains unchanged
- D. Contracts and domes up
Explanation: During inspiration, the diaphragm contracts and flattens, increasing thoracic volume and drawing air in.
Correct answer: Contracts and flattens- A. Histoplasmosis
- B. Tuberculosis
- C. Cystic Fibrosis
- D. None of these
Explanation: None of the given options are correct.. Cystic fibrosis is a disorder that damages your lungs, digestive tract, and other organs.
Correct answer: None of these- A. The relaxation of the muscles of the diaphragm
- B. Relaxation of the external intercostal muscles
- C. Increased pressure
- D. The contraction of the muscles of the diaphragm
Explanation: Option A occurs during expiration, as the diaphragm's muscles relax, causing the chest cavity space to decrease and the air is pushed…
Correct answer: The contraction of the muscles of the diaphragm- A. Contracts
- B. Relaxes
- C. Contracts and relaxes
- D. None of these options is correct
Explanation: Inspiration is the first phase of breathing, in which we inhale air.
Correct answer: Contracts- A. Lungs pull air inside
- B. Passive transport of air takes place
- C. Active expansion of lungs takes place
- D. Air is pushed inside
Explanation: During inspiration active expansion of air occurs and expiration is due to a passive contraction due to the elasticity of the lungs.
Correct answer: Active expansion of lungs takes place- A. 3.5 litres
- B. 2.5 litres
- C. 5 litres
- D. 10 litres
Explanation: When the lungs are fully inflated, the total lung capacity in liters for an average adult human is around 5 liters.
Correct answer: 5 litres- A. As Bicarbonate ions
- B. In the form of dissolved gas molecules
- C. By binding to R.B.C
- D. As Carbaminohaemoglobin.
Explanation: (a) : About 70% of CO2 (about 2.5ml per 100 ml. of blood), received by blood from the tissues, enters the RBCs where it reacts with water…
Correct answer: As Bicarbonate ions- A. Passive transport
- B. Active transport
- C. Simple diffusion.
- D. Both A and C
Explanation: All options are explained below: Option D is correct. a)The exchange of gases in the alveoli of the lungs takes place by Passive…
Correct answer: Both A and C- A. Nonciliated columnar
- B. Nonciliated squamous
- C. Ciliated columnar
- D. Ciliated squamous.
Explanation: All options are explained below: a) Nonciliated Columnar:Nonciliated columnar epithelium is not the primary type of epithelium found in…
Correct answer: Nonciliated squamous- A. Pleural membrane
- B. Myocardium
- C. Pericardium
- D. Both B and C
Explanation: "The explanation for this question will be added soon!".
Correct answer: Pleural membrane- A. 2
- B. 4
- C. 3
- D. 5
Explanation: There are two types: 1.Acute bronchitis. This is more common. Symptoms last a few weeks, but it doesn't usually cause problems past that…
Correct answer: 2- A. R.B.C
- B. Parabronchi
- C. Pleura
- D. None of these
Explanation: An enzyme present in red blood cells, carbonic anhydrase, aids in the conversion of carbon dioxide to carbonic acid and bicarbonate ions.
Correct answer: R.B.C- A. Bronchi
- B. Mucus
- C. Pharynx
- D. Glottis
Explanation: Mucus in the nasal cavity captures all the dirt and bacteria and is responsible for moisture amd warmth in the nasal cavity
Correct answer: Mucus- A. Carboxyhaemoglobin
- B. Plasma proteins
- C. Bicarbonate ions
- D. In dissolved form
Explanation: Most of the Carbon dioxide about 70% is carried as bicarbonate ions.
Correct answer: Bicarbonate ions