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

Why do mammalian lungs have numerous alveoli?

  1. For increasing volume of inspired air

  2. For keeping the lungs in proper shape and position

  3. For higher number of muscles to provide greater elasticity

  4. For increasing surface area for gaseous diffusion
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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Multiple choice

True/False Inhalation eases you deeper into a posture

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In yoga, exhalation is typically used to move deeper into a posture, as it helps the body release tension and relax into the stretch. Inhalation is generally used to lengthen the spine or prepare for a movement.

Multiple choice

Aerobic capacity relates to your _________.

  1. brain

  2. uncle

  3. heart and lungs

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

Aerobic capacity (or VO2 max) measures the ability of the heart and lungs to supply oxygen to the muscles during sustained physical activity.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Which of the following correctly illustrates the passage of oxygen in the respiratory system?

  1. Nostrils--> trachea--> bronchus--> bronchiole--> alveoli

  2. Nostrils--> trachea--> bronchiole--> alveoli

  3. Nostrils--> bronchiole--> alveoli

  4. Nostrils--> alveoli
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The pathway of air through the respiratory system is through 
nasal cavities (or oral cavity) > pharynx > trachea > primary bronchi (right & left) > secondary bronchi > tertiary bronchi > bronchioles > alveoli (site of gas exchange). Hence, Nostrils--> trachea--> bronchus--> bronchiole--> alveoli  is   the passage of oxygen in the respiratory system.
So, the correct answer is 'Nostrils--> trachea--> bronchus--> bronchiole--> alveoli'.
Multiple choice respiratory system human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Air goes from pharynx to.

  1. Trachea

  2. Bronchus

  3. Bronchi

  4. Bronchiole
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • The nasal cavity and the mouth meet at the pharynx, or throat, at the back of the nose and mouth. 
  • From there, air quickly enters the second part of your respiratory system, the trachea or windpipe. 
  • The trachea is a tube that delivers air to the lungs, the third and most important part of your respiratory system. Hence, Air goes from the pharynx to. trachea.
So, the correct answer is 'trachea'.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Bronchi divide into

  1. Bronchus

  2. Bronchioles

  3. Alveoli

  4. Air sacs
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • The bronchi (or bronchus) are the air passages into the lungs that begin at the end of the trachea. 
  • There are two bronchi, one for each lung. 
  • The bronchus divides into smaller branches known as segmental bronchi, which divide again into bronchioles, Hence, Bronchi divide into bronchioles.
So, the correct answer is 'bronchioles'.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Which is not function of 'conductiing part' of respiratory system?

  1. Clears the air from foreign particles

  2. Humidifies the air

  3. Brings the air to body temperature

  4. It is site for diffusion of oxygen and carbon dioxide

  5. Transports air to alveoli
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The conducting part of the respiratory system includes the nose, pharynx, larynx, trachea, bronchi, and bronchioles. Its primary functions are to transport, filter, warm, and humidify the air. The alveoli are the specific site for gas exchange, which is part of the respiratory zone, not the conducting zone.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Choose the correct statements with regard to human respiration:
(a) Inspiration is faciliated by contraction of phrenic and internal intercostal muscles
(b) Healthy human can inhale or exhale about $2000-3000$ml of air/min
(c) Functional residual capacity represents the volume of left out air in lungs after expiration
(d) Total lung capacity is the total volume of air that would be accomodated in the lunds after forced inspiration.

  1. a, c

  2. b, d

  3. c, d

  4. a, b
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement (c) is correct as functional residual capacity is the volume of air remaining in the lungs after a normal expiration. Statement (d) is correct as total lung capacity is the maximum volume of air the lungs can hold after a forced inspiration. Statement (a) is incorrect because inspiration is primarily facilitated by the diaphragm and external intercostal muscles, not internal ones. Statement (b) is incorrect because a healthy human typically breathes about 6000-8000 ml of air per minute.

Multiple choice biology coordination in life processes ingestion of food mechanism of digestion


Air or food is prevented from going into the trachea during swallowing by the

  1. larynx

  2. epiglottis

  3. pharynx

  4. tongue
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Epiglottis stands open during breathing, allowing air into the larynx. During swallowing it closes to prevent aspiration, forcing the swallowed liquids or food to go into the esophagus instead. It is thus the structure that diverts passage air into  the trachea and food into the esophagus

So, the correct answer is 'epiglottis'