Gaseous Exchange Mdcat Mcqs online test 1

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Instructions for Chapter Gaseous Exchange Online Test Mdcat-2023:

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Test Details:

Subject: Biology
Class: 1st year or 11
Chapter name: Gaseous Exchange
Test: MDCAT 2023
Book: Sindh Textbook
Total No. Of MCQS: 50
Time Allowed: 50 Minutes

651

Created on July 12, 2023 By

medicoengineer.com

Mdcat Biology XI Gaseous Exchange Mcqs test 1

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NameEmailPhone Number

1 / 50

1. Pharynx leads air into larynx through opening is called

a) epiglottis

b) glottis

c) Both A & B

d) trachea

2 / 50

2. Both lungs contain _____ million alveoli

a) 700 billion

b) 800 million

c) 700 million

d) 800 billion

3 / 50

3. which of the following transport more CO2

a) H2O

b) CO2

c) Sodium ion

d) potassium ion

4 / 50

4. ________ Hb molecules in each RBC

a) 280 billion

b) 280 million

c) both A & B

d) None of these

5 / 50

5. Lungs are :

a) Paired

b) soft

c) Sponge

d) All of these

6 / 50

6. The lateral wall of chest cavity of man is composed of

a) Ribs

b) intercostal muscles

c) ribs and intercostal muscles

d) ribs intercostal muscles and diaphragm

7 / 50

7. when you inhale the diaphragm ?

a) relax and move upward

b) relax and moved downward

c) contract and move upward

d) contract and move downward

8 / 50

8. Vital capacity average about

a) 4 liters

b) 3 liters

c) 5 liters

d) 6 liters

9 / 50

9. Breathing is example of:

a) counter current exchange

b) cellular respiration

c) Ventilation

d) Diffusion

10 / 50

10. common opening of food as well as air

a) nasal cavity

b) larynx

c) pharynx

d) Trachea

11 / 50

11. water of plasma transport _____% of CO2

a) 10%

b) 5%

c) 7%

d) 12%

12 / 50

12. TB is caused by:

a) virus

b) bacterium

c) both A &B

d) Allergies

13 / 50

13. Pharynx is common for food and air. But food does not pass into trachea:

a) Due to the presence of internal nostrils

b) Due to the presence of oesophageal sphincter

c) Due to the presence of glottis

d) Due to the presence of epiglottis

14 / 50

14. Bicarbonate ions are formed in the red blood cells:

a) It is due to partial pressure is higher in RBCs.

b) It is due to presence of carbonic anhydrase

c) Both A and B

d) None of these

15 / 50

15. In alveoli, gaseous exchange occurs by the process of:

a) Active transport

b) Facilitated diffusion

c) Osmosis

d) Diffusion

16 / 50

16. Hemoglobin Carries time more oxygen than plasma

a) 50

b) 70

c) 40

d) 60

17 / 50

17. What is true option about larynx?

I) It links pharynx to the trachea.

II) It possesses vocal cords.

III) It It lies below the pharynx.

a) I only

b) II only

c) III only

d) I, II and III

18 / 50

18. During the process of CO2 transport:

a) Haemoglobin acts as a buffer

b) Carbonic anhydrase acts as a buffer

c) Plasma acts as a buffer

d) Oxygen acts as a buffer

19 / 50

19. The amount of air inhaled, exhaled and stored within the lungs at any given time is:

a) Vital capacity

b) Tidal volume

c) Respiratory volume

d) Breathing rate

20 / 50

20. From the nasal cavity, air passes through:

a) Larynx → Trachea → Pharynx

b) Pharynx → Voice box → Trachea

c) Pharynx → Trachea → Larynx

d) Pharynx → Larynx → Trachea

21 / 50

21. Alveoli can expand and recoil easily during breathing; because their walls consist of:

a) Collagen

b) Glycoproteins

c) Elastin proteins

d) A and C

22 / 50

22. What causes the rib cage to move upward and forward during inhalation process?

a) Contraction of the external intercostal muscles

b) Relaxation of the internal intercostal muscles

c) Contraction of the internal intercostal muscles

d) A and B

23 / 50

23. Inspiration and expiration occur in a cyclical manner due to the movements of:

a) Chest wall

b) Lungs

c) Both A and B

d) None of these

24 / 50

24. What is the role of lung surfactant?

a) It increases surface tension of water on alveoli

b) It decreases surface tension of water on alveoli

c) It increases elasticity of lungs

d) It decreases gas exchange

25 / 50

25. Emotions acting through _____ can affect respiratory centre.

a) Cerebral cortex of brain

b) Limbic system of brain

c) Medulla oblongata of brain

d) All of these

26 / 50

26. The centralized iron-containing group that is encircled by the alpha and beta subunits

of haemoglobin is:

a) Myoglobin

b) Haeme group

c) Tetrose

d) None of these

27 / 50

27. Breathing process is regulated by:

a) Dorsal respiratory group of medulla oblongata

b) Ventral respiratory group of medulla oblongata

c) Alveoli

d) A and B

28 / 50

28. A network of small branches leading from bronchi to lung tissue and finally to air-sac is:

a) Trachea

b) Nasal chamber

c) Bronchioles

d) Alveoli

29 / 50

29. the total average lungs capacity of adult human is

a) 4 liters

b) 5 liters

c) 2 liters

d) 1 liters

30 / 50

30. Most of the CO2 produced in the tissues is:

a) Transported to lungs as NaCl

b) Transported to lungs as CaCO3

c) Transported to lungs as Bicarbonates

d) Transported to lungs as carbonates

31 / 50

31. which one of the following is correct sequence of respiratory passages in man

a) larynx ~pharynx ~ bronchi ~ trachea ~ lungs

b) pharynx ~larynx ~ trachea ~ bronchi ~ lungs

c) trachea ~ larynx ~ pharynx~ Bronchi ~lungs

d) bronchi ~ trachea ~larynx ~ pharynx ~ lungs

32 / 50

32. A decrease in air pressure inside thoracic cavity

a) result in transport gas

b) result in inhalation

c) result in partial pressure

d) result in exhalation

33 / 50

33. carbonic acid is synthesized

a) from CO2 and H2O

b) from CO2 and O2

c) from H2O and O2

d) from Hb and CO2

34 / 50

34. All of the following structures are important component of respiratory system except

a) mediastinum

b) pharynx

c) Alveoli

d) trachea

35 / 50

35. When air inhale in to respiratory tract

a) air is filtered

b) air is warmed

c) air humidified

d) All of these

36 / 50

36. Alveoli become inflated

a) during inhalation

b) during exhalation

c) both A& B

d) None of these

37 / 50

37. Diaphragm muscle is type of

a) skeleton muscle

b) smooth muscles

c) cardiac muscle

d) None of these

38 / 50

38. breathing in man is regulated by

a) muscle in the wall of lungs

b) Diaphragm muscle

c) Intercostal muscles

d) both B & C

39 / 50

39. The iron components of myoglobin

a) can bind with four oxygen molecules

b) Can bind with one oxygen molecules

c) can bind with two oxygen molecules

d) can bind with three oxygen molecules

40 / 50

40. The membrane that covers the lungs

a) pericardial

b) diaphragm

c) pleura

d) none of these

41 / 50

41. which one of the following is generally known as respiratory center

a) cerebellum

b) cerebrum

c) cranial nerve

d) medulla oblongata

42 / 50

42. The humans left lungs contain

a) four lobes

b) three lobes

c) two lobes

d) one large lobes

43 / 50

43. Air enters in lungs through

a) Two bronchioles

b) Many Alveoli

c) two primary bronchi

d) Many bronchioles

44 / 50

44. The gas that is released during process of respiration

a) carbon dioxide

b) oxygen

c) hydrogen

d) All of these

45 / 50

45. In lungs the alveolar epithelium is

a) ciliated columnar

b) non ciliated columnar

c) ciliated squamous

d) non ciliated squamous

46 / 50

46. Approximately_________ of carbon dioxide is carried in a blood as a bicarbonate ions

a) 70%

b) 60%

c) 50%

d) 25%

47 / 50

47. Right human lungs contain

a) four lobes

b) three lobes

c) two lobes

d) one large lobes

48 / 50

48. The amount of extra air inhaled during a deep breath is called.

a) total lung capacity

b) inspiratory reserved volume

c) tidal volume

d) expiratory reserved volume

49 / 50

49. The component of respiratory system in which gases exchange occurs

a) Trachea

b) larynx

c) Alveoli

d) pharynx

50 / 50

50. Oxygen binds with haemoglobin

a) At its high partial pressure

b) At its low partial pressure

c) both A&B

d) None of these

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Instructions for Chapter Gaseous Exchange Online Test Mdcat-2023:

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