Free Respiration MCQs with Answers

• A. Plasma membrane
• B. Mucous membrane
• C. Meninges
• D. Epithelial membrane

Explanation: The medial surface has a mucosal lining that forms the lateral aspect of the respiratory part of the glottis.

• A. Breathing
• B. Respiration
• C. Diffusion
• D. Osmosis

Explanation: The process through which animals take oxygen (O2) from the air and release carbon dioxide (CO2) into the air is called "Breathing".

• A. Voice Production
• B. Energy Production
• C. Glucose Production
• D. Air Production

Explanation: The primary function of the vocal cords is to help in voice production.

• A. The diaphragm contracts, expanding the thoracic cavity
• B. Passive transport of air occurs
• C. Air expands inside the lungs
• D. Air is pushed into the lungs

Explanation: The correct answer is that the diaphragm contracts, expanding the thoracic cavity.

• A. Protein and disaccharide
• B. Protein and lipid
• C. Lipid and carbohydrate
• D. Carbohydrate and vitamins

Explanation: Surfactant is an agent that decreases the surface tension between two media.

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

Explanation: Emphysema destroys alveolar walls, reducing the surface area and causing permanent lung tissue loss.

• A. Epiglottis
• B. Trachea
• C. Bronchi
• D. None of these

Explanation: The correct answer is Option B: Trachea. The trachea is supported by C-shaped cartilaginous rings that prevent its collapse and allow it…

• A. Bronchi
• B. Mucous
• C. Pharynx duct
• D. Glottis

Explanation: When you inhale, the air is first conditioned in the nasal cavity so it reaches the lungs at an appropriate temperature and humidity and…

• A. 3.5 litres
• B. 2.5 litres
• C. 5-6 litres
• D. 10 litres

Explanation: When the lungs are fully inflated, the total lung capacity in liters for an average adult human is around 5-6 liters.

• A. Pharynx
• B. Diaphragm
• C. Bronchi
• D. None of these options are correct

Explanation: The diaphragm is a thin dome-shaped muscle that separates the thoracic cavity (lungs and heart) from the abdominal cavity (intestines…

• A. 3.5 Liters
• B. 0.5 Liters
• C. 5.0 Liters
• D. 1.5 Liters

Explanation: Residual volume is the amount of air that always remains inside the lungs even after a person has forcefully exhaled as much air as…

• A. Tracheal cells
• B. Goblet cells
• C. Surfactant cells
• D. Pleural cells

Explanation: The primary function of goblet cells is to synthesize and secrete mucus.All the other type of cells mentioned are part of respiratory…

• A. Pleura
• B. Alveoli
• C. Chest cage
• D. Diaphragm

Explanation: Chest cavity is bounded by ribs, muscles and diaphragm

• A. Scorpion
• B. Earthworm
• C. Frog
• D. Cockroaches
• E. Fish

Explanation: A book lung is a type of respiration organ used for atmospheric gas exchange that is present in many arachnids, such as scorpions and…

• A. Histoplasmosis
• B. Tuberculosis
• C. Cystic fibrosis
• D. None of the given options

Explanation: Options B and C are easier to eliminate. Use the figure below to help remember why to eliminate histoplasmosis.

• A. Carbon dioxide
• B. Oxygen
• C. Dust
• D. Carbon Monoxide

Explanation: Goblet cells produce mucus that traps the dust particles; this mucus is then beaten by cilia.

• A. O2
• B. CO2
• C. CO
• D. H2

Explanation: If the pH of blood is lower than normal (normal physiological pH is 7.4), then the haemoglobin does not bind oxygen as well.

• A. 50 times
• B. 20 times
• C. 70 times
• D. 100 times
• E. 200 times

Explanation: Oxygen is carried in the blood in two forms:(1)Plasma and (2) Hemoglobin. Hemoglobin carries 70 times more oxygen than plasma.

• A. Myoglobin
• B. Globin
• C. Haemoglobin
• D. Hemocyanin

Explanation: Myoglobin is a pigment that has the highest affinity to bind with oxygen.

• A. Trachea
• B. Bronchus
• C. Alveoli
• D. Nasal sac
• E. Larynx

Explanation: Pharynx leads to the air into the larynx through glottis, as shown in the diagram below: