Stages of Respiration


 
 
Concept Explanation
 

Stages of Respiration

Stages of RespirationThere are two stages of respiration:

  • External respiration: a process in which they take in oxygen and give off carbon dioxide:
  • Breathing: it is the process of taking the required gas and giving out waste or un - required gases. It involves inhalation and exhalation, e.g. an aerobic organism such as human beings takes in oxygen and gives out carbon dioxide.
  • Gaseous exchange: it takes place between blood and alveolar air across the alveolar wall, i.e. diffusion of oxygen from lungs to blood and carbon dioxide from blood to lungs. In plants, it occurs through stomata.
  • Internal respiration: it is the gaseous exchange between arterial blood and the body cells.
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    Sample Questions
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    Question : 1

    Which of the following are correct ?

    (a) Internal respiration is the gaseous exchange between arterial blood and the body cells.

    (b) External respiration is a process in which organism take in oxygen and give off carbon dioxide .

    (c) Breathing is the process of taking the required gas and giving out waste or not required gases. It involves inhalation and exhalation

     

    Right Option : D
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    Question : 2

    Which of the following are correct ?

    (a) External respiration is a process in which the organism takes in carbon dioxide and give off oxygen .

    (b) Internal respiration is the gaseous exchange between arterial blood and the body cell

    Right Option : B
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    Explanation
    Question : 3

    Which of the following are correct ?

    (a) External respiration is a process in which organism take in carbon dioxide and give off oxygen .

    (b) Breathing is the process of taking the required gas and giving out waste or not required gases. It involves inhalation and exhalation.

    (c) An aerobic organism such as human beings takes in oxygen and gives out carbon dioxide.

    Right Option : B
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