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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 process moves oxygen from lungs to blood?

Osmosis

Filtration

Diffusion

Active transport

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

Stays constant

Increases above atmospheric pressure

Decreases below atmospheric pressure

Matches atmospheric pressure

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

Bronchus

Pharynx

Trachea

Nasal cavity

4. What is tidal volume?

Volume of oxygen in blood

Air remaining after exhalation

Air exchanged in a normal breath

Maximum air that can be exhaled

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

Damaged cilia and excess mucus

Lung expansion

Low immunity

Infection

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

Paralyzes or destroys them

Has no effect

Increases their activity

Strengthens their movement

7. How does smoking contribute to chronic bronchitis?

Strengthens immune system

Irritates bronchi and causes long-term inflammation

Reduces blood flow

Increases lung elasticity

8. Which of the following best describes exhalation?

Absorption of oxygen

Passive process involving muscle relaxation

Sudden air intake

Active contraction of diaphragm

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

Cilia and mucus in the airways

Kidney function

Bile

Stomach acid

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

Chronic cough

Skin rash

High blood sugar

Joint pain

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

Trachea

Nasal cavity

Larynx

Pharynx

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

Bronchitis

Pneumonia

Emphysema

Asthma

13. What is the function of the bronchioles?

Filter blood

Transport air to alveoli

Exchange gases

Produce mucus

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

It cannot be detected early

It has no relation to smoking

It often begins in the bronchi

It is caused by bacteria

15. What happens when alveolar walls break down?

Faster breathing

Better lung capacity

Improved oxygen absorption

Reduced surface area for gas exchange

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

Tuberculosis

Lung cancer

Hepatitis

Typhoid

17. What happens to the chest cavity during exhalation?

Expands more

Becomes larger

Contracts and volume decreases

Remains unchanged

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

Bronchi

Nose

Larynx

Trachea

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

Regulate temperature

Produce energy

Exchange gases

Filter blood

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

Methane

Carbon dioxide

Oxygen

Nitrogen

21. Which part of the brain controls breathing?

Cerebrum

Hypothalamus

Cerebellum

Medulla oblongata

22. During inhalation, what happens to the diaphragm?

Contracts and moves downward

Relaxes and moves upward

Expands sideways

Contracts and moves upward

23. What is the main function of the trachea?

Filter and moisten air

Site of gas exchange

Trap carbon dioxide

Transport air to bronchi

24. How does smoking affect lung alveoli?

Strengthens their walls

Destroys them over time

Increases their number

Cleans them

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

Excretory system

Nervous system

Digestive system

Circulatory system

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

Water vapor

Nicotine

Oxygen

Carbon monoxide

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

Traps dust and microbes

Increases oxygen

Lubricates the lungs

Breaks down food

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

It increases cilia movement

It improves immunity

It raises oxygen levels

It impairs immune cells and damages mucosal barriers

29. Which organ is directly responsible for breathing?

Heart

Kidney

Lungs

Liver

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

Residual volume

Tidal volume

Inspiratory reserve volume

Vital capacity

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

Low oxygen levels in muscles

Rising carbon dioxide levels in blood

High nitrogen levels

Low heart rate

32. What is the medical term for breathing?

Inhalation

Circulation

Ventilation

Respiration

33. What surrounds the alveoli to facilitate gas exchange?

Veins

Bronchioles

Capillaries

Arteries

34. What is the function of intercostal muscles?

Move ribs during breathing

Help in heart contractions

Produce mucus

Filter air

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

Nose → Trachea → Larynx → Bronchi → Alveoli

Nose → Larynx → Trachea → Bronchi → Alveoli

Nose → Bronchi → Trachea → Alveoli

Mouth → Bronchi → Larynx → Trachea → Alveoli

36. What is the role of hemoglobin in respiration?

Produces enzymes

Filters oxygen

Transports oxygen in the blood

Traps bacteria

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

Carbon dioxide

Hydrogen

Nitrogen

Oxygen

38. Which muscle is primarily responsible for breathing?

Abdominal muscle

Intercostal muscle

Pectoral muscle

Diaphragm

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

Bronchi

Trachea

Pharynx

Larynx

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

Trachea

Bronchi

Alveoli

Bronchioles

41. What structure branches into bronchi?

Trachea

Pharynx

Nose

Larynx

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

Trachea

Alveoli

Bronchi

Pleura

43. 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

44. 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

45. 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

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

Digestion

Photosynthesis

Cellular respiration

Excretion

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

Ventilation

Inhalation

Exhalation

Respiration

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

Trachea

Pharynx

Nasal cavity

Alveoli

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

Arthritis

Diabetes

Asthma

Lung cancer

50. Which structure prevents food from entering the trachea?

Epiglottis

Alveolus

Larynx

Pharynx

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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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