Biology

Respiration and Gas Exchange

989 Questions

Access a targeted set of questions on respiration and gas exchange for competitive exams. Topics include lung volumes, the mechanism of breathing, and respiratory anatomy. Understanding these physiological processes is essential for scoring well.

Lung volumes and capacitiesBreathing mechanismsRespiratory anatomyGas exchange processes

Respiration and Gas Exchange Questions

Multiple choice general knowledge

Does your left lung small than your right one ?

  1. Not a chance

  2. No

  3. Yes

  4. May be
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The claimed answer C (Yes) is correct. The left lung is smaller than the right lung because the heart is positioned on the left side of the chest cavity, occupying space that would otherwise be part of the left lung. The left lung has only two lobes compared to the right lung's three lobes. Option D (May be) is vague, while A and B are incorrect.

Multiple choice

Respiratory quotient is 0.7 for

  1. carbohydrates

  2. proteins

  3. fats

  4. fats associated with carbohydrate synthesis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The respiratory quotient for fats such as tripalmitin is 0.7.

Multiple choice

Lungs are enclosed by

  1. pericardium

  2. renal capsule

  3. pleura

  4. glisson's capsule
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The lungs are surrounded by a thin membrane known as the pleura which lines the thoracic cavity.

Multiple choice

Which of the following statements is/are false?

a. During exhalation, the ribs move downwards and inwards. b. During inhalation, the diaphragm moves up, making the chest cavity larger. c. From trachea, the air goes through two smaller tubes called bronchi.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as this statement is false. During inhalation, the ribs move upwards and outwards, and the diaphragm moves downwards.

Multiple choice

During hibernation, frogs respire by

  1. external gills

  2. lungs and buccopharyngeal cavity

  3. internal gills

  4. moist skin

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Frogs use their skin to soak in the oxygen their bodies require. When they hibernate, they utilize the skin for any and all breathing. Damp skin is a must for subcutaneous gas exchange. If a frog's skin becomes dry, it will no longer be able to take in oxygen.

Multiple choice

Which part of the respiratory system warms and humidifies the inspired air?

  1. Anterior vestibule

  2. Posterior vestibule

  3. Turbinate

  4. Paranasal sinus

  5. Mouth
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Along the sides of the vestibule are turbinates; mucous membrane covered projections that contain a very rich blood supply from the internal and external carotid arteries. They warm and humidify the inspired air.

Multiple choice

Which part of respiratory system protects the lower airway from expiration?

  1. Uvula

  2. Palatine tonsil

  3. Hyoid bone

  4. Tongue

  5. Epiglottis
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The epiglottis is a leaf shaped structure, immediately posterior to the base of the tongue, above the larynx. When food or liquids are swallowed, the epiglottis closes over the larynx, protecting the lower airways from aspiration.