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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. Which gas diffuses from the alveoli into the blood?

Oxygen

Methane

Carbon dioxide

Nitrogen

2. What is the medical term for breathing?

Ventilation

Respiration

Circulation

Inhalation

3. How does smoking contribute to chronic bronchitis?

Increases lung elasticity

Reduces blood flow

Irritates bronchi and causes long-term inflammation

Strengthens immune system

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

Exhalation

Respiration

Inhalation

Ventilation

5. What is the main function of the trachea?

Trap carbon dioxide

Site of gas exchange

Transport air to bronchi

Filter and moisten air

6. What is tidal volume?

Volume of oxygen in blood

Maximum air that can be exhaled

Air exchanged in a normal breath

Air remaining after exhalation

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

It cannot be detected early

It is caused by bacteria

It has no relation to smoking

It often begins in the bronchi

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

Dissolves in plasma

Destroys red blood cells

Binds with hemoglobin, reducing oxygen transport

Enhances oxygen binding

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

Tuberculosis

Lung cancer

Typhoid

Hepatitis

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

Less physical activity

Weakened diaphragm

Damaged alveoli and reduced surface area

High carbon dioxide levels in blood

11. 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

12. What is the function of the bronchioles?

Filter blood

Produce mucus

Transport air to alveoli

Exchange gases

13. How does smoking affect lung alveoli?

Strengthens their walls

Destroys them over time

Increases their number

Cleans them

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

Vital capacity

Tidal volume

Inspiratory reserve volume

Residual volume

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

Pharynx

Trachea

Nasal cavity

Alveoli

16. Which muscle is primarily responsible for breathing?

Pectoral muscle

Diaphragm

Abdominal muscle

Intercostal muscle

17. What is the function of intercostal muscles?

Produce mucus

Filter air

Move ribs during breathing

Help in heart contractions

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

Regulate temperature

Exchange gases

Filter blood

Produce energy

19. What happens when alveolar walls break down?

Reduced surface area for gas exchange

Improved oxygen absorption

Faster breathing

Better lung capacity

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

Emphysema

Pneumonia

Bronchitis

Asthma

21. What is the role of hemoglobin in respiration?

Produces enzymes

Filters oxygen

Traps bacteria

Transports oxygen in the blood

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

Nasal cavity

Trachea

Bronchus

Pharynx

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

Digestion

Cellular respiration

Photosynthesis

Excretion

24. Which organ is directly responsible for breathing?

Liver

Kidney

Heart

Lungs

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

Increases their activity

Paralyzes or destroys them

Strengthens their movement

Has no effect

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26. What happens to the chest cavity during exhalation?

Becomes larger

Contracts and volume decreases

Expands more

Remains unchanged

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

Oxygen

Carbon monoxide

Nicotine

Water vapor

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

Nervous system

Excretory system

Circulatory system

Digestive system

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

Decreases below atmospheric pressure

Matches atmospheric pressure

Increases above atmospheric pressure

Stays constant

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

Breaks down food

Lubricates the lungs

Increases oxygen

Traps dust and microbes

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

Damaged cilia and excess mucus

Low immunity

Lung expansion

Infection

32. What structure branches into bronchi?

Larynx

Nose

Trachea

Pharynx

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

Larynx

Pharynx

Nasal cavity

Trachea

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

It improves immunity

It increases cilia movement

It impairs immune cells and damages mucosal barriers

It raises oxygen levels

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

Trachea

Nose

Larynx

Bronchi

36. Which of the following best describes exhalation?

Passive process involving muscle relaxation

Absorption of oxygen

Active contraction of diaphragm

Sudden air intake

37. What surrounds the alveoli to facilitate gas exchange?

Bronchioles

Veins

Capillaries

Arteries

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

Bronchioles

Trachea

Bronchi

Alveoli

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

Higher red blood cell count

Stronger heart

Improved ventilation and alveolar efficiency

Frequent use of inhalers

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

Kidney function

Stomach acid

Cilia and mucus in the airways

Bile

41. Which structure prevents food from entering the trachea?

Epiglottis

Pharynx

Alveolus

Larynx

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

Joint pain

Chronic cough

High blood sugar

Skin rash

43. Which process moves oxygen from lungs to blood?

Diffusion

Osmosis

Active transport

Filtration

44. Which part of the brain controls breathing?

Hypothalamus

Cerebellum

Cerebrum

Medulla oblongata

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

Carbon dioxide

Oxygen

Nitrogen

Hydrogen

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

Bronchi

Alveoli

Trachea

Pleura

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

Mouth → Bronchi → Larynx → Trachea → Alveoli

Nose → Trachea → Larynx → Bronchi → Alveoli

Nose → Bronchi → Trachea → Alveoli

Nose → Larynx → Trachea → Bronchi → Alveoli

48. During inhalation, what happens to the diaphragm?

Contracts and moves downward

Relaxes and moves upward

Contracts and moves upward

Expands sideways

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

Trachea

Pharynx

Larynx

Bronchi

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

Diabetes

Arthritis

Lung cancer

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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MDCAT Biology Respiration Test

MDCAT Biology Respiration Chaper 13 Online Test

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