Quiz for Breathing

Q1: What is the primary muscle involved in inspiration?

A. Diaphragm B. Intercostal muscles C. Abdominal muscles D. Pectoral muscles

Q2: Which part of the brain regulates breathing?

A. Cerebellum B. Cerebrum C. Medulla oblongata D. Thalamus

Q3: The volume of air inspired or expired during normal breathing is called:

A. Inspiratory reserve volume B. Tidal volume C. Residual volume D. Expiratory reserve volume

Q4: Which gas has the highest affinity for hemoglobin?

A. Oxygen B. Carbon dioxide C. Carbon monoxide D. Nitrogen

Q5: Which structure prevents the entry of food into the trachea?

A. Pharynx B. Epiglottis C. Larynx D. Bronchi

Q6: What is the function of alveoli in lungs?

A. Transport of gases B. Moistening air C. Exchange of gases D. Filter air

Q7: The total lung capacity is the sum of:

A. Tidal volume and inspiratory reserve volume B. Vital capacity and residual volume C. Expiratory reserve and inspiratory reserve volume D. Residual and tidal volume

Q8: Which is the correct sequence of air passage during inhalation?

A. Nasal cavity → Pharynx → Larynx → Trachea → Bronchi → Alveoli B. Nasal cavity → Larynx → Pharynx → Trachea → Bronchi → Alveoli C. Pharynx → Nasal cavity → Trachea → Larynx → Alveoli D. Nasal cavity → Trachea → Larynx → Bronchi → Alveoli

Q9: The respiratory pigment in humans is:

A. Hemoglobin B. Myoglobin C. Chlorocruorin D. Haemocyanin

Q10: Partial pressure of oxygen in alveoli is approximately:

A. 159 mmHg B. 104 mmHg C. 40 mmHg D. 95 mmHg

Q11: Which condition causes difficulty in breathing due to inflammation of bronchioles?

A. Asthma B. Emphysema C. Tuberculosis D. Pneumonia

Q12: Which enzyme converts CO₂ to bicarbonate in RBCs?

A. Carbonic anhydrase B. Amylase C. Pepsin D. Lipase

Q13: Which of the following is not a part of the respiratory system?

A. Trachea B. Liver C. Alveoli D. Larynx

Q14: Exchange of gases occurs by the process of:

A. Active transport B. Facilitated diffusion C. Diffusion D. Osmosis

Q15: The breathing rate in a normal adult is approximately:

A. 12-16 times/minute B. 20-24 times/minute C. 8-10 times/minute D. 25-30 times/minute

Q16: In which form is most of the CO₂ transported in the blood?

A. Carbaminohemoglobin B. Dissolved in plasma C. Bicarbonate ion D. As carbonic acid

Q17: Vital capacity includes:

A. TV + ERV + IRV B. TV + RV C. IRV + ERV + RV D. ERV + TV

Q18: Which disease damages alveolar walls and reduces surface area?

A. Asthma B. Emphysema C. Pneumonia D. Bronchitis

Q19: How many lobes are present in the human right lung?

A. 1 B. 2 C. 3 D. 4

Q20: Which of the following helps in expiration?

A. Contraction of diaphragm B. Relaxation of diaphragm C. Contraction of intercostal muscles D. Expansion of thoracic cavity