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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 part of the respiratory system contains vocal cords?

Bronchi

Trachea

Larynx

Pharynx

2. How does smoking contribute to chronic bronchitis?

Reduces blood flow

Strengthens immune system

Increases lung elasticity

Irritates bronchi and causes long-term inflammation

3. Which muscle is primarily responsible for breathing?

Abdominal muscle

Diaphragm

Intercostal muscle

Pectoral muscle

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

Oxygen

Carbon monoxide

Water vapor

Nicotine

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

Higher red blood cell count

Frequent use of inhalers

Improved ventilation and alveolar efficiency

Stronger heart

6. 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

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

Paralyzes or destroys them

Increases their activity

Has no effect

Strengthens their movement

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

Larynx

Trachea

Bronchi

Nose

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

Arthritis

Diabetes

Asthma

Lung cancer

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

Traps dust and microbes

Increases oxygen

Breaks down food

Lubricates the lungs

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

Respiration

Inhalation

Exhalation

Ventilation

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

Digestive system

Nervous system

Excretory system

Circulatory system

13. Which part of the brain controls breathing?

Cerebellum

Hypothalamus

Cerebrum

Medulla oblongata

14. What structure branches into bronchi?

Trachea

Nose

Pharynx

Larynx

15. Which of the following best describes exhalation?

Active contraction of diaphragm

Passive process involving muscle relaxation

Sudden air intake

Absorption of oxygen

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

Infection

Lung expansion

Low immunity

Damaged cilia and excess mucus

17. Which process moves oxygen from lungs to blood?

Active transport

Diffusion

Osmosis

Filtration

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

Nasal cavity

Pharynx

Trachea

Larynx

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

Residual volume

Inspiratory reserve volume

Tidal volume

Vital capacity

20. Which organ is directly responsible for breathing?

Kidney

Lungs

Liver

Heart

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

Bronchi

Trachea

Pleura

Alveoli

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

It increases cilia movement

It impairs immune cells and damages mucosal barriers

It improves immunity

It raises oxygen levels

23. Which structure prevents food from entering the trachea?

Alveolus

Epiglottis

Pharynx

Larynx

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

Dissolves in plasma

Enhances oxygen binding

Destroys red blood cells

Binds with hemoglobin, reducing oxygen transport

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

Hydrogen

Oxygen

Nitrogen

Carbon dioxide

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

Stays constant

Decreases below atmospheric pressure

Matches atmospheric pressure

Increases above atmospheric pressure

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

Alveoli

Trachea

Bronchioles

Bronchi

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

Nose → Trachea → Larynx → Bronchi → Alveoli

Nose → Bronchi → Trachea → Alveoli

Nose → Larynx → Trachea → Bronchi → Alveoli

Mouth → Bronchi → Larynx → Trachea → Alveoli

29. What is tidal volume?

Air remaining after exhalation

Air exchanged in a normal breath

Maximum air that can be exhaled

Volume of oxygen in blood

30. What is the function of the bronchioles?

Exchange gases

Filter blood

Transport air to alveoli

Produce mucus

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

Methane

Nitrogen

Carbon dioxide

Oxygen

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

Pharynx

Nasal cavity

Bronchus

Trachea

33. 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

34. What is the main function of the trachea?

Transport air to bronchi

Filter and moisten air

Trap carbon dioxide

Site of gas exchange

35. What is the function of intercostal muscles?

Produce mucus

Filter air

Move ribs during breathing

Help in heart contractions

36. What happens to the chest cavity during exhalation?

Remains unchanged

Contracts and volume decreases

Becomes larger

Expands more

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

Skin rash

High blood sugar

Joint pain

Chronic cough

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

Typhoid

Hepatitis

Lung cancer

Tuberculosis

39. During inhalation, what happens to the diaphragm?

Contracts and moves downward

Expands sideways

Relaxes and moves upward

Contracts and moves upward

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

Regulate temperature

Exchange gases

Filter blood

Produce energy

41. What happens when alveolar walls break down?

Better lung capacity

Reduced surface area for gas exchange

Faster breathing

Improved oxygen absorption

42. What surrounds the alveoli to facilitate gas exchange?

Capillaries

Bronchioles

Veins

Arteries

43. What is the medical term for breathing?

Ventilation

Respiration

Circulation

Inhalation

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

Alveoli

Nasal cavity

Trachea

Pharynx

45. 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

46. What is the role of hemoglobin in respiration?

Transports oxygen in the blood

Produces enzymes

Filters oxygen

Traps bacteria

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

Pneumonia

Asthma

Emphysema

Bronchitis

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

It often begins in the bronchi

It cannot be detected early

It has no relation to smoking

It is caused by bacteria

49. How does smoking affect lung alveoli?

Strengthens their walls

Destroys them over time

Increases their number

Cleans them

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

Excretion

Cellular respiration

Digestion

Photosynthesis

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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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