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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 structure branches into bronchi?

Nose

Larynx

Pharynx

Trachea

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

Bronchioles

Alveoli

Bronchi

Trachea

3. Which process moves oxygen from lungs to blood?

Diffusion

Filtration

Active transport

Osmosis

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

Rising carbon dioxide levels in blood

High nitrogen levels

Low oxygen levels in muscles

Low heart rate

5. Which structure prevents food from entering the trachea?

Pharynx

Larynx

Epiglottis

Alveolus

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

Asthma

Diabetes

Arthritis

Lung cancer

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

Breaks down food

Traps dust and microbes

Increases oxygen

Lubricates the lungs

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

It has no relation to smoking

It often begins in the bronchi

It cannot be detected early

It is caused by bacteria

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

Respiration

Inhalation

Exhalation

Ventilation

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

Oxygen

Water vapor

Nicotine

Carbon monoxide

11. What is the function of the bronchioles?

Filter blood

Produce mucus

Exchange gases

Transport air to alveoli

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

Emphysema

Pneumonia

Bronchitis

Asthma

13. During inhalation, what happens to the diaphragm?

Contracts and moves downward

Contracts and moves upward

Relaxes and moves upward

Expands sideways

14. What happens when alveolar walls break down?

Faster breathing

Improved oxygen absorption

Better lung capacity

Reduced surface area for gas exchange

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

Nose → Bronchi → Trachea → Alveoli

Nose → Trachea → Larynx → Bronchi → Alveoli

Mouth → Bronchi → Larynx → Trachea → Alveoli

Nose → Larynx → Trachea → Bronchi → Alveoli

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

Pharynx

Nasal cavity

Alveoli

Trachea

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

Tidal volume

Vital capacity

Inspiratory reserve volume

Residual volume

18. Which part of the brain controls breathing?

Cerebrum

Cerebellum

Medulla oblongata

Hypothalamus

19. What is tidal volume?

Volume of oxygen in blood

Air exchanged in a normal breath

Air remaining after exhalation

Maximum air that can be exhaled

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

Joint pain

Chronic cough

Skin rash

High blood sugar

21. Which of the following best describes exhalation?

Sudden air intake

Absorption of oxygen

Active contraction of diaphragm

Passive process involving muscle relaxation

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

Stomach acid

Cilia and mucus in the airways

Bile

Kidney function

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

Bronchi

Trachea

Pleura

Alveoli

24. What is the main function of the trachea?

Filter and moisten air

Site of gas exchange

Transport air to bronchi

Trap carbon dioxide

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

Damaged alveoli and reduced surface area

Weakened diaphragm

High carbon dioxide levels in blood

Less physical activity

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26. What is the medical term for breathing?

Ventilation

Inhalation

Respiration

Circulation

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

Bronchi

Trachea

Pharynx

Larynx

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

Bronchi

Trachea

Nose

Larynx

29. Which muscle is primarily responsible for breathing?

Diaphragm

Intercostal muscle

Pectoral muscle

Abdominal muscle

30. What is the role of hemoglobin in respiration?

Traps bacteria

Filters oxygen

Transports oxygen in the blood

Produces enzymes

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

Has no effect

Strengthens their movement

Increases their activity

Paralyzes or destroys them

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

Oxygen

Hydrogen

Nitrogen

Carbon dioxide

33. How does smoking affect lung alveoli?

Strengthens their walls

Destroys them over time

Cleans them

Increases their number

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

It increases cilia movement

It impairs immune cells and damages mucosal barriers

It raises oxygen levels

It improves immunity

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

Typhoid

Tuberculosis

Lung cancer

Hepatitis

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

Digestion

Excretion

Photosynthesis

Cellular respiration

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

Carbon dioxide

Oxygen

Nitrogen

Methane

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

Higher red blood cell count

Improved ventilation and alveolar efficiency

Frequent use of inhalers

Stronger heart

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

Pharynx

Trachea

Larynx

Nasal cavity

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

Binds with hemoglobin, reducing oxygen transport

Dissolves in plasma

Enhances oxygen binding

Destroys red blood cells

41. What happens to the chest cavity during exhalation?

Contracts and volume decreases

Remains unchanged

Expands more

Becomes larger

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

Bronchus

Nasal cavity

Trachea

Pharynx

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

Stays constant

Increases above atmospheric pressure

Decreases below atmospheric pressure

Matches atmospheric pressure

44. Which organ is directly responsible for breathing?

Kidney

Heart

Liver

Lungs

45. What surrounds the alveoli to facilitate gas exchange?

Capillaries

Arteries

Veins

Bronchioles

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

Lung expansion

Infection

Damaged cilia and excess mucus

Low immunity

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

Nervous system

Excretory system

Digestive system

Circulatory system

48. What is the function of intercostal muscles?

Move ribs during breathing

Produce mucus

Help in heart contractions

Filter air

49. How does smoking contribute to chronic bronchitis?

Increases lung elasticity

Reduces blood flow

Strengthens immune system

Irritates bronchi and causes long-term inflammation

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

Regulate temperature

Produce energy

Exchange gases

Filter blood

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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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