Breathing and Exchange of Gases NEET Questions :
Breathing and Exchange of Gases NEET Questions is Scoring topic where candidates can attempt to solve maximum number of accurate questions and increase their overall score count in the NEET exam. Not only in NEET exams but in other competitive exams as well, Breathing and Exchange of Gases is considered to be the most Scoring and Simple Chapter. The aim of this Chapter Breathing and Exchange of Gases MCQ is to test candidates’ awareness and knowledge regarding the Breathing and Exchange of Gases.
These NEET Questions on Breathing and Exchange of Gases for class 12 Pdf Download will help students score in the upcoming NEET exam and perform better in competitive exams, such as CET, NET, SET. Hence, it is suggested to students to solve all these Breathing and Exchange of Gases MCQ Questions for NEET with their problem-solving skills and cross-check the answers. Also, try to maintain a time limit for each question. Below is the list of all the Important MCQ on Breathing and Exchange of Gases. Here you can get the MCQs with answers and also download PDFs provided for each topic for extra MCQ on Breathing and Exchange of Gases to practise more.
NEET Questions on Breathing and Exchange of Gases :
1. If expiratory reserve volume is 1100 ml residual volume is 1200 ml and tidal volume is 500 ml, what shall be the functional residual capacity____
(1) 1600 ml
(2) 2800 ml
(3) 2300 ml
(4) 1200 ml
Answer: 3
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2. Air filled in dead space is_______
(1) 150 cc
(2) 350 cc
(3) 500 cc
(4) 1500 cc
Answer: 1
3. Very high number of alveoli present in a lung is meant for______
(1) More space for increasing volume of inspired air
(2) More area for diffusion
(3) Making the organ spongy
(4) Increasing nerve supply
Answer: 2
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4. Expiration involves________
(1) Relaxation of diaphragm and intercostal muscles
(2) Contraction of diaphragm and intercostal muscles
(3) Contraction of diaphragm muscles
(4) Contraction of intercostal muscles
Answer: 1
5. The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic :-
(1) D – Lower end of lungs – diaphragm pulls it down during inspiration
(2) A – trachea - long tube supported by complete cartilaginous rings for conducting inspired air
(3) B – pleural membrane - surround ribs on both sides to provide cushion against rubbing
(4) C – Alveoli - thin walled vascular bag like structures for exchange of gases
Answer: 4
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6. Abdominal breathing refers to_______
(1) Normal breathing
(2) Slow breathing
(3) Fast breathing
(4) Forceful breathing
Answer: 1
7. Residual volume is________
(1) lesser than tidal volume
(2) greater than inspiratory volume
(3) greater than vital capacity
(4) greater than tidal volume
Answer: 4
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8. Which of the following is an occupational respiratory disorder ?
(1) Anthracis
(2) Silicosis
(3) Botulism
(4) Emphysema
Answer: 2
9. Oxygen dissociation curve represents :-
(1) percent saturation of Hb with oxygen
(2) partial pressure of oxygen
(3) partial pressure of carbondioxide
(4) percent saturation of Hb with carbondioxide
Answer: 1
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10. CO2 binds to a, b chain of haemoglobin to form_______
(1) carbaminohaemoglobin
(2) oxyhaemoglobin
(3) deoxyhaemoglobin
(4) carboxyhaemoglobin
Answer: 1
11. Oxygen dissociation curve shifts to right when_______
(1) PO² decreases
(2) PCo² decreases
(3) pH increases
(4) Temperature decreases
Answer: 1
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12. Asthma may be attributed to_____
(1) bacterial infection of the lungs
(2) allergic reaction of the mast cells in the lungs
(3) inflammation of the trachea
(4) accumulation of fluid in the lungs
Answer: 2
13. The partial pressure of oxygen in the alveoli of the lungs is _______
(1) Less than that in the blood
(2) Less than that of carbon dioxide
(3) Equal to that in the blood
(4) More than that in the blood
Answer: 4
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14. Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because :-
(1) There is a positive intrapleural pressure
(2) Pressure in the lungs is higher than the atomospheric pressure.
(3) There is a negative pressure in the lungs.
(4) There is a negative intrapleural pressure pulling at the lung walls
Answer : 4
15. Respiratory rhythm centre is regulated by_____
(1) Difference between solubility of gases
(2) Chemosensitive area present in medulla oblongata for PCO² and pH
(3) Diencephalon and Brain stem
(4) Chemosensitive area present in the wall of lungs
Answer : 2
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16. Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of______
(1) Inspiratory Reserve Volume
(2) Tidal Volume
(3) Expiratory Reserve Volume
(4) Residual Volume
Answer : 4
17. 'CO' poisoning causes the decrease in oxygen availability to the tissues because :-
(1) It binds the haemoglobin and to form stable compound carboxyhaemoglobin
(2) It increases CO2 concentration in our body.
(3) It is a toxic gas so main body organs like brain, failure occured.
(4) 'CO' impedes the CO2 transportation.
Answer : 1
18. Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively ?
(1) Inflammation of bronchioles; Decreased respiratory surface
(2) Increased number of bronchioles; Increased respiratory surface
(3) Increased respiratory surface; Inflammation of bronchioles
(4) Decreased respiratory surface; Inflammation of bronchioles
Answer : 1
19. Bulk of carbon dioxide (CO2) released from body tissues into the blood is present as :
(1) Carbamino-haemoglobin in RBCs
(2) Bicarbonate in blood plasma and RBCs
(3) Free CO2 in blood plasma
(4) 70% carbamino-haemoglobin and 30% as bicarbonate
Answer : 2
20. Which one of the following is the correct statement for respiration in humans ?
(1) Workers in grinding and stone-breaking industries may suffer, from lung fibrosis
(2) Abut 90% of carbon dioxide (CO2) is carried by haemoglobin as carbamino haemoglobin
(3) Cigarette smoking may lead to inflammation of bronchi
(4) Neural signals from pneumotoxic centre in pons region of brain can increase the duration of inspiration
Answer : 1
21. People who have migrated from the planes to an area adjoining Rohtang pass about six months back_______
(1) suffer from altitude sickness with symptoms like nausea, fatigue, etc.
(2) have the usual RBC count but their haemoglobin has very high binding affinity to O2
(3) have more RBCs and their haemoglobin has a lower binding affinity to O2
(4) are not physically fit to play games like football
Answer : 3
22. During swallowing of food which of the following structures prevent the entering of food into the glottis?
(1) Semilunar Valve
(2) Circular Muscular flap
(3) Cartilaginous flap
(4) Circular sphincter
Answer: 3
23. What is true about RBCs in humans ?
(1) They do not carry CO2 at all
(2) They carry about 20-25 per cent of CO2
(3) They transport 99.5 per cent of O2
(4) They transport about 80 percent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma.
Answer: 2
24. Respiratory rhythm centre is present in :-
(1) Pons region
(2) Aortic arch
(3) Medulla region
(4) Carotid artery
Answer: 3
25. Chronic disorder in which alveolar wall are damged due to which respiratory surface is decreased. One of the major causes of this is cigarette smoking :-
(1) Asthma
(2) Emphysema
(3) Bronchitis
(4) Fibrosis
Answer: 2
26. Regarding the functions of our conduction respiratory system, mark the wrong entry.
(1) Humidifies the air
(2) Warms up the air
(3) Diffusion of gases
(4) Cleans up the air
Answer: 3
27. Total volume of air accomodate in the lungs at the end of forced inspiration :-
(1) TV + IRV
(2) TV + IRV + ERV
(3) TV + ERV
(4) TV + IRV + ERV + RV
Answer: 4
28. Mark the true statement among the following with reference to normal breathing
(1) Inspiration is a passive process where as expiration is active
(2) Inspiration is a active process where as expiration is passive
(3) Inspiration and expiration are active processes
(4) Inspiration and expiration are passive processes
Answer: 2
29. A person breathes in some volume of air by forced inspiration after having a forced expiration. This quantity of air taken in is
(1) Total lung capacity
(2) Tidal volume
(3) Vital capacity
(4) Inspiratory capacity
Answer: 3
30. What is true about diffusion capacity.
(1) Diffusion capacity of CO2 is much higher than O2
(2) Diffusion capacity of O2 is much higher than CO2
(3) Diffusion capacity of O2 and CO2 is same
(4) None of the above
Answer: 1
31. Which of the following statement cis true :
(1) 20-25 percent CO2 is transported by RBCs.
(2) 97 percent O2 is transported by RBCs.
(3) 70 percent CO2 is carried as bicarbonate.
(4) All of these are true.
Answer: 4
32. Two friends are eating together on a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of______
(1) Epiglottis
(2) Diaphragm
(3) Neck
(4) Tongue
Answer: 1
33. Which is a common passage for food and air______
(1) Trachea
(2) Oesophagus
(3) Pharynx
(4) Glottis
Answer: 3
34. The function of conducting part in respiratory system of human is_______
(1) Clears foreign particles.
(2) Humidifies atmospheric air
(3) Brings the air to body temperature
(4) All of the above
Answer: 4
35. When there is no air in initial bronchioles, they does not collapse. it is due to_______
(1) Presence of Lecithin
(2) Presence of incomplete cartilagenous rings
(3) Presence of complete cartilagenous rings
(4) Presence of mucous
Answer: 2
36. Which of the following steps not involved in respiration_______
(1) Diffusion of gases across alveolar membrane
(2) Transport of gases by the blood
(3) Provide nutrients to all the living cells of body
(4) Utilisation of O2 by the cells for catabolic reactions and resultant release of CO2.
Answer: 3
37. Inspiration can occur, when_________
(1) Pressure within the lungs is less than the atmospheric pressure.
(2) Pressure within the lungs is more than the atmospheric pressure.
(3) Pressure within the lungs and atmospheric air is same.
(4) No effect of pressure on inspiration.
Answer: 1
38. By the contraction in diaphragm volume of thoracic chamber increases in the :-
(1) Dorso-ventral axis
(2) Antero-posterior axis
(3) Dorso-posterior axis
(4) Antero-ventral axis
Answer: 2
39. The primary muscle of inspiration is :-
(1) Diaphragm
(2) Intercostal muscle
(3) Abdominal muscle
(4) Oblique muscle
Answer: 1
40. Total volume of air a person can expire after normal inspiration is :-
(1) Vital capacity
(2) Functional residual capacity
(3) Inspiratory capacity
(4) Expiratory capacity
Answer: 4
41. Which of the following factor can affect the rate of diffusion of gases?
(1) Thickness of the membrances involved in diffusion
(2) Solubility of the gases
(3) Pressure of the gases
(4) All of these
Answer: 4
42. Which of the following statement/s is/are correct?
A- A high concentration of carbonic anhydrase is present in RBC.
B- Minute quantities of carbonic anhydrase is present in plasma.
C- Every 100 ml blood delivers approximately 4 ml of CO2 to the alveoli.
D- 20-25% CO2 is carried by haemoglobin as carbaminohaemoglobin.
(1) A, C and D
(2) A and D
(3) A, B, C and D
(4) Only A
Answer: 3
43. Which of the following centre can moderate the functions of the respiratory rhythm centre.
(1) Dorsal respiratory centre
(2) Ventral respiratory centre
(3) Pneumotaxic centre
(4) Chemosensitive centre
Answer: 3
44. Consdider the following four statements (a-d) and select the option which includes all the correct ones only :-
(a) All the time of inspiration, contraction in diaphragm and external intercostal muscles take place.
(b) Normal breathing is also called as abdominal breathing.
(c) Expiration during sneezing, coughing, yoga is normal expiration during which IICM and abdominal muscles relax.
(d) Inspiration can occur if the pressure within lungs (intra pulmonary pressure) is more then the atmospheric pressure.
(1) Statements (a), (b), (c), (d)
(2) Statements (a) only
(3) Statements (a), (b), (c)
(4) Statements (a) and (b)
Answer: 4
45. Which of the following statement is not correct_____
(1) Formation of oxyhaemoglobin is a process of oxidation.
(2) Every 100 ml of oxygenated blood can deliver around 5 ml of O2 to tissue under physiological condition.
(3) Dissociation curve is curve between percentage saturation of Hb with oxygen and partial pressure of oxygen.
(4) High concentration of CO2 activates dissociation of oxyhaemoglobin is called Bohr's effect.
Answer: 1
46. In Lungs there is definite exchange of ions between RBC and Plasma. Removal of CO2 from blood involves –
(1) efflux of Cls ions from RBC
(2) influx of Cls ions into RBC.
(3) influx of 3HCOs ions into Plasma.
(4) efflux of 3HCOs ions from RBC.
Answer: 1
47. The chloride content of RBC will be higher than that of plasma in :-
(1) Systemic arteries and pulmonary veins
(2) Systemic veins and pulmonary arteries
(3) Systemic arteries and pulmonary arteries
(4) Systemic veins and pulmonary veins
Answer: 2
48. Which of the following lung volumes or capacities can be measured by spirometer :
(1) Functional residual capacity [FRC]
(2) Residual volume
(3) Total lung capacity [TLC]
(4) Vital capacity
Answer: 4
49. What happens in Hamburger shift ?
(1) HCO3– ions move out from the RBC and Cl– ions enters into RBC
(2) Cl– ions move out from the RBC and HCO3– ions enters into RBC
(3) H+ ions move out from the plasma and Cl– ions enters into RBC
(4) HCO3– ions move out from the plasma and Cl– ions enters into plasma
Answer: 1
50. The respiratory membranes facilitates the exchange of respiratory gases through diffusion. Oxygen enters the deoxygenated blood through diffusion because :-
(1) Partial pressure of oxygen in alveolar air and capillaries is 40 mm Hg and 100 mm Hg respectively
(2) Partial pressure of oxygen in alveolar air and capillaries is 100 mm Hg and 40 mm Hg respectively
(3) Partial pressure of oxygen in alveolar air and capillaries is 46 mm Hg and 40mm Hg respectively
(4) Partial pressure of oxygen in alveolar air and capillaries it 40 mm Hg and 46 mm Hg respectively
Answer: 2