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MDCAT Biology Respiration Online Test

Mustansar KhanLast Updated: June 14, 2025

MDCAT Biology Respiration Test

MDCAT Biology Respiration Chaper 13 Online Test

Total Questions:	50
Time Allowed:	25 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	MDCAT Entry Test Biology Online Test Interview Questions about Biology All Universities Entrance Test Recruitments Tests

MDCAT Biology Respiration MCQS Online Test

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1. What is the term for the movement of air into and out of the lungs?

Respiration

Inhalation

Exhalation

Ventilation

2. What is the main function of the trachea?

Transport air to bronchi

Trap carbon dioxide

Filter and moisten air

Site of gas exchange

3. Which of the following is an early symptom of lung damage due to smoking?

Skin rash

High blood sugar

Chronic cough

Joint pain

4. What is the primary function of the respiratory system?

Produce energy

Exchange gases

Filter blood

Regulate temperature

5. What is the medical term for breathing?

Circulation

Ventilation

Inhalation

Respiration

6. Which of the following best describes exhalation?

Passive process involving muscle relaxation

Sudden air intake

Absorption of oxygen

Active contraction of diaphragm

7. Which of the following is true about lung cancer?

It often begins in the bronchi

It is caused by bacteria

It has no relation to smoking

It cannot be detected early

8. Which condition is commonly caused by long-term smoking?

Asthma

Arthritis

Diabetes

Lung cancer

9. Which structure prevents food from entering the trachea?

Larynx

Epiglottis

Alveolus

Pharynx

10. What is the role of mucus in the respiratory tract?

Increases oxygen

Breaks down food

Lubricates the lungs

Traps dust and microbes

11. Which part of the respiratory system contains vocal cords?

Bronchi

Pharynx

Larynx

Trachea

12. How does carbon monoxide from cigarette smoke affect oxygen transport?

Dissolves in plasma

Enhances oxygen binding

Binds with hemoglobin, reducing oxygen transport

Destroys red blood cells

13. What is the correct sequence of airflow during inhalation?

Mouth → Bronchi → Larynx → Trachea → Alveoli

Nose → Larynx → Trachea → Bronchi → Alveoli

Nose → Bronchi → Trachea → Alveoli

Nose → Trachea → Larynx → Bronchi → Alveoli

14. Which gas diffuses from the alveoli into the blood?

Oxygen

Carbon dioxide

Methane

Nitrogen

15. Which part of the brain controls breathing?

Cerebellum

Hypothalamus

Cerebrum

Medulla oblongata

16. Which part of the respiratory system acts as a resonating chamber for voice?

Nasal cavity

Pharynx

Alveoli

Trachea

17. Which of the following best explains why athletes often have better lung capacity?

Improved ventilation and alveolar efficiency

Stronger heart

Higher red blood cell count

Frequent use of inhalers

18. What structure branches into bronchi?

Nose

Pharynx

Trachea

Larynx

19. Which gas is transported from the blood to the alveoli to be exhaled?

Nitrogen

Hydrogen

Oxygen

Carbon dioxide

20. Which of the following structures is the main site of gas exchange in the lungs?

Trachea

Alveoli

Bronchi

Bronchioles

21. Which muscle is primarily responsible for breathing?

Intercostal muscle

Pectoral muscle

Diaphragm

Abdominal muscle

22. What surrounds the alveoli to facilitate gas exchange?

Veins

Arteries

Bronchioles

Capillaries

23. How does chronic smoking increase the risk of infections?

It impairs immune cells and damages mucosal barriers

It increases cilia movement

It raises oxygen levels

It improves immunity

24. Which organ system works closely with the respiratory system for gas transport?

Digestive system

Nervous system

Circulatory system

Excretory system

25. How does smoking contribute to chronic bronchitis?

Strengthens immune system

Irritates bronchi and causes long-term inflammation

Reduces blood flow

Increases lung elasticity

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26. What is the main cause of reduced oxygen uptake in smokers?

High carbon dioxide levels in blood

Weakened diaphragm

Damaged alveoli and reduced surface area

Less physical activity

27. Which structure warms, moistens, and filters the air we breathe?

Nose

Trachea

Bronchi

Larynx

28. Which process moves oxygen from lungs to blood?

Osmosis

Filtration

Active transport

Diffusion

29. What is the function of the bronchioles?

Transport air to alveoli

Filter blood

Exchange gases

Produce mucus

30. What part of the respiratory system divides into left and right branches?

Pharynx

Trachea

Nasal cavity

Larynx

31. How does the body primarily detect the need to breathe faster?

Low oxygen levels in muscles

High nitrogen levels

Rising carbon dioxide levels in blood

Low heart rate

32. What is the role of hemoglobin in respiration?

Filters oxygen

Traps bacteria

Transports oxygen in the blood

Produces enzymes

33. What effect does smoking have on cilia in the respiratory tract?

Strengthens their movement

Increases their activity

Paralyzes or destroys them

Has no effect

34. How does smoking affect lung alveoli?

Increases their number

Strengthens their walls

Cleans them

Destroys them over time

35. Which part of the lungs are damaged in emphysema?

Pleura

Alveoli

Bronchi

Trachea

36. What is the main reason for coughing in smokers?

Low immunity

Lung expansion

Infection

Damaged cilia and excess mucus

37. What happens to the chest cavity during exhalation?

Expands more

Remains unchanged

Contracts and volume decreases

Becomes larger

38. What is tidal volume?

Maximum air that can be exhaled

Volume of oxygen in blood

Air remaining after exhalation

Air exchanged in a normal breath

39. What happens when alveolar walls break down?

Improved oxygen absorption

Better lung capacity

Faster breathing

Reduced surface area for gas exchange

40. During inhalation, what happens to the diaphragm?

Contracts and moves downward

Expands sideways

Contracts and moves upward

Relaxes and moves upward

41. Which of the following helps protect the lungs from harmful substances in the air?

Cilia and mucus in the airways

Stomach acid

Bile

Kidney function

42. What is the function of intercostal muscles?

Help in heart contractions

Move ribs during breathing

Filter air

Produce mucus

43. Which disease is strongly linked to both active and passive smoking?

Typhoid

Hepatitis

Lung cancer

Tuberculosis

44. Which process uses oxygen to produce energy in body cells?

Cellular respiration

Photosynthesis

Excretion

Digestion

45. Which organ is directly responsible for breathing?

Heart

Lungs

Kidney

Liver

46. Which of the following is a major component of cigarette smoke that damages lung tissue?

Oxygen

Nicotine

Carbon monoxide

Water vapor

47. Which of the following respiratory structures is shared with the digestive system?

Trachea

Nasal cavity

Pharynx

Bronchus

48. Which term refers to the maximum amount of air exhaled after a deep breath?

Vital capacity

Inspiratory reserve volume

Residual volume

Tidal volume

49. Which respiratory disease involves inflammation and narrowing of airways?

Asthma

Bronchitis

Emphysema

Pneumonia

50. What happens to the air pressure in lungs during inhalation?

Decreases below atmospheric pressure

Stays constant

Matches atmospheric pressure

Increases above atmospheric pressure

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Mustansar KhanLast Updated: June 14, 2025

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MDCAT Biology Respiration Online Test

MDCAT Biology Respiration Test

MDCAT Biology Respiration Chaper 13 Online Test

MDCAT Biology Respiration MCQS Online Test

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Mustansar Khan

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MDCAT Biology Respiration Test

MDCAT Biology Respiration Chaper 13 Online Test

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