Respiration in Human Beings in Respiration In Organisms – Class 7 Science Experiment

Chapter Name: Respiration In Organisms

Activity Name: Respiration in Human Beings in Respiration In Organisms

Activity Description:

Respiration in Human Beings in Respiration In Organisms - Class 7 Science Experiment

In this activity, we will investigate how long a person can hold their breath by closing their mouth and nose. Using a watch or counting at a uniform rate, we will measure the duration for which the participant can keep their mouth and nose closed without allowing air to pass through.

Required Items:

  1. Watch with a seconds’ needle or a method to measure time (e.g., counting at a uniform rate).

Step by Step Procedure:

  1. Find a comfortable and quiet place to perform the experiment.
  2. Take a deep breath and close your mouth tightly.
  3. Use your fingers to pinch your nose closed, ensuring no air can pass through your nose or mouth.
  4. Start the watch or begin counting from zero as soon as you close your mouth and nose.
  5. Continue holding your breath for as long as possible until you feel the urge to breathe again.
  6. Note the time taken in seconds or the number of counts when you finally take a breath.

Experiment Observations:

  • Record the time duration (in seconds) or the number of counts it took until the participant had to take a breath.


  1. Perform this activity in a safe environment to avoid accidents or injuries.
  2. If you feel uncomfortable or experience any dizziness during the experiment, release your breath immediately and take a break.
  3. Avoid holding your breath for an extended period, as it may be harmful.

Lesson Learnt from Experiment:

Through this experiment, we learn about the limitations of human breath-holding capacity and the body’s natural reflex to breathe when oxygen levels decrease and carbon dioxide levels increase in the bloodstream.

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