Biology

Respiration and Gas Exchange

958 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

Which of the following give rise to respiratory bronchioles?

  1. Alveoli

  2. Lobar bronchi

  3. Terminal bronchi

  4. Terminal bronchioles
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

After a few divisions, terminal bronchioles give rise to respiratory bronchioles. After a few division, terminal bronchioles gives rise to respiratory bronchioles.

Multiple choice

Which of the following is incorrect regarding the different steps of respiration?

  1. Breathing or pulmonary ventilation facilitates intake of alveolar air and expulsion of atmospheric air.

  2. Diffusion of gases takes place across alveolar membrane.

  3. Oxygen is transported to the tissue by blood.

  4. Diffusion of O2 and CO2 takes place between blood and tissues.

  5. Catabolism leads to utilisation of O2 by the cells and the release of CO2.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Breathing or pulmonary ventilation facilitates intake of atmospheric air and expulsion of alveolar air.

Multiple choice

Bezold-Jarisch reflex involves

  1. increase in respiratory rate

  2. cardiovascular and neurological processes

  3. prevention of over-inflation of lungs

  4. elevation of the scrotum and testis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bezold-Jarisch reflex involves a variety of cardiovascular and neurological processes which cause hypopnea and bradycardia.

Multiple choice

What prevents dust particles from getting into the respiratory system?

  1. Fine hair and mucus in the nose

  2. The air pipe in the nose is very thin

  3. There are bends in the air way in the nose

  4. The skin inside the nose acts as dust conditioner

  5. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Correct. Fine hair and mucus are present inside the nose to prevent dust particles from getting into the respiratory system.

Multiple choice

The mechanism of breathing through deepening the inhale in an organism is regulated by ___________.

  1. the Hering-Breuer reflex

  2. the spinal cord reflex

  3. the nasopulmonary and nasothoracic reflexes

  4. central chemoreceptors

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

The nasopulmonary and nasothoracic reflexes regulate the mechanism of breathing through deepening the inhale. Triggered by the flow of air, the pressure of the air in the nose, and the quality of the air, impulses from the nasal mucosa are transmitted by the trigeminal nerve to the breathing centres in the brainstem and the generated response is transmitted to the bronchi, the intercostal muscles and the diaphragm.