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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 main reason for coughing in smokers?

Lung expansion

Infection

Low immunity

Damaged cilia and excess mucus

2. Which of the following best describes exhalation?

Absorption of oxygen

Passive process involving muscle relaxation

Active contraction of diaphragm

Sudden air intake

3. How does smoking affect lung alveoli?

Increases their number

Strengthens their walls

Destroys them over time

Cleans them

4. How does smoking contribute to chronic bronchitis?

Reduces blood flow

Strengthens immune system

Irritates bronchi and causes long-term inflammation

Increases lung elasticity

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

Cilia and mucus in the airways

Stomach acid

Kidney function

Bile

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

Stronger heart

Higher red blood cell count

Frequent use of inhalers

Improved ventilation and alveolar efficiency

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

Photosynthesis

Excretion

Digestion

Cellular respiration

8. What is the function of intercostal muscles?

Help in heart contractions

Move ribs during breathing

Filter air

Produce mucus

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

Nose

Trachea

Bronchi

Larynx

10. What happens when alveolar walls break down?

Better lung capacity

Improved oxygen absorption

Faster breathing

Reduced surface area for gas exchange

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

Hydrogen

Oxygen

Nitrogen

Carbon dioxide

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

Carbon dioxide

Nitrogen

Oxygen

Methane

13. Which structure prevents food from entering the trachea?

Larynx

Alveolus

Pharynx

Epiglottis

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

Less physical activity

Damaged alveoli and reduced surface area

High carbon dioxide levels in blood

Weakened diaphragm

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

Lung cancer

Hepatitis

Tuberculosis

Typhoid

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

Strengthens their movement

Paralyzes or destroys them

Increases their activity

Has no effect

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

Chronic cough

Joint pain

High blood sugar

Skin rash

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

Nasal cavity

Pharynx

Trachea

Bronchus

19. What is the medical term for breathing?

Ventilation

Inhalation

Respiration

Circulation

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

Produce energy

Exchange gases

Filter blood

Regulate temperature

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

Traps dust and microbes

Increases oxygen

Breaks down food

Lubricates the lungs

22. What is the main function of the trachea?

Transport air to bronchi

Filter and moisten air

Site of gas exchange

Trap carbon dioxide

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

Respiration

Exhalation

Inhalation

Ventilation

24. What happens to the chest cavity during exhalation?

Remains unchanged

Contracts and volume decreases

Expands more

Becomes larger

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

Binds with hemoglobin, reducing oxygen transport

Enhances oxygen binding

Destroys red blood cells

Dissolves in plasma

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

Nasal cavity

Alveoli

Pharynx

Trachea

27. What is tidal volume?

Volume of oxygen in blood

Maximum air that can be exhaled

Air remaining after exhalation

Air exchanged in a normal breath

28. What is the role of hemoglobin in respiration?

Filters oxygen

Traps bacteria

Produces enzymes

Transports oxygen in the blood

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

Pharynx

Larynx

Bronchi

Trachea

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

It raises oxygen levels

It impairs immune cells and damages mucosal barriers

It improves immunity

It increases cilia movement

31. 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

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

Diabetes

Asthma

Arthritis

Lung cancer

33. Which organ is directly responsible for breathing?

Liver

Heart

Lungs

Kidney

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

Decreases below atmospheric pressure

Stays constant

Matches atmospheric pressure

Increases above atmospheric pressure

35. Which process moves oxygen from lungs to blood?

Diffusion

Osmosis

Active transport

Filtration

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

Residual volume

Tidal volume

Vital capacity

Inspiratory reserve volume

37. What surrounds the alveoli to facilitate gas exchange?

Bronchioles

Capillaries

Arteries

Veins

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

Bronchi

Alveoli

Bronchioles

Trachea

39. What structure branches into bronchi?

Pharynx

Nose

Trachea

Larynx

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

Oxygen

Carbon monoxide

Water vapor

Nicotine

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

Rising carbon dioxide levels in blood

Low oxygen levels in muscles

High nitrogen levels

Low heart rate

42. What is the function of the bronchioles?

Exchange gases

Produce mucus

Filter blood

Transport air to alveoli

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

Nose → Larynx → Trachea → Bronchi → Alveoli

Nose → Trachea → Larynx → Bronchi → Alveoli

Nose → Bronchi → Trachea → Alveoli

Mouth → Bronchi → Larynx → Trachea → Alveoli

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

Larynx

Trachea

Nasal cavity

Pharynx

45. Which part of the brain controls breathing?

Cerebellum

Hypothalamus

Medulla oblongata

Cerebrum

46. During inhalation, what happens to the diaphragm?

Contracts and moves upward

Relaxes and moves upward

Contracts and moves downward

Expands sideways

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

Nervous system

Excretory system

Circulatory system

Digestive system

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

Trachea

Pleura

Bronchi

Alveoli

49. Which muscle is primarily responsible for breathing?

Abdominal muscle

Intercostal muscle

Diaphragm

Pectoral muscle

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

Pneumonia

Bronchitis

Emphysema

Asthma

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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

MDCAT Biology Respiration MCQS Online Test

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Mustansar Khan

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