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

Breathing is controlled by ___________.

  1. lungs

  2. trachea

  3. medulla

  4. intercostal muscles

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

Breathing is controlled by the lower part of the brain stem located in medulla oblongata.

Multiple choice

Faster breathing in high fever condition is due to ___________.

  1. additional requirement of oxygen for invading germs

  2. high temperature of the body

  3. mental worries of the patient

  4. loss of appetite

  5. increase in carbon dioxide concentration
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rate of respiration thus breathing increases with the increase in the temperature.

Multiple choice

During inspiration, the diaphragm ____________.

  1. relaxes and becomes dome shaped

  2. contracts and flattens

  3. expands and flattens

  4. shows no change

  5. looses its control
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This happens in inspiration to accommodate maximum amount of air in the lungs.

Multiple choice

Which of the following statements is correct regarding respiration in the fetus and newborn?

  1. The peripheral chemoreceptors are well functional in the developing embryo and in a newborn.

  2. In the newborn, complete output of the right ventricle is sent to the lungs.

  3. Deficiency of surfactant in the newborn has no effect on respiration.

  4. The first breath in a newborn is associated with numerous modulation in the intrathoracic pressure.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The newborns first breath the lungs, which were filled with fluid during pregnancy. The lungs must suddenly fill with oxygen from the air. The fluid in the lungs is removed through the blood and lymph system, and is replaced by air. At the same time, vigorous blood circulation in the lungs begins.

Multiple choice

Mesothelioma is an aggressive cancer that destroys the membranes of the lungs. Which of the following statements is true regarding mesothelioma?

  1. Incidence of mesothelioma is decreasing as a consequence of the ban on use of asbestos.

  2. It is more common in females.

  3. All deaths due to mesothelioma should be reported to the coroner.

  4. Radical surgery is the best treatment of this disease.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As mesothelioma is often associated to the exposure to asbestos, if a person dies from it then it is the duty of a coroner to find out if the death was due to the deceased being exposed to asbestos in a workplace or in the surroundings.

Multiple choice

Photorespiration is favoured by

  1. high oxygen and low carbon dioxide

  2. low temperature

  3. low light intensity

  4. low oxygen and high carbon dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

High concentration of oxygen and low carbon dioxide favour photorespiration.

Multiple choice

Which of the following organs help earthworm in respiration?

  1. Lungs

  2. Gills

  3. Trachea

  4. Spiracles

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

Earthworms respire through their moist skin, a process called cutaneous respiration. They have no specialized respiratory organs like lungs, gills, or trachea. Oxygen diffuses directly through their skin into their bloodstream, and carbon dioxide diffuses out. This requires their skin to remain moist for gas exchange to occur.