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:
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:
- Watch with a seconds’ needle or a method to measure time (e.g., counting at a uniform rate).
Step by Step Procedure:
- Find a comfortable and quiet place to perform the experiment.
- Take a deep breath and close your mouth tightly.
- Use your fingers to pinch your nose closed, ensuring no air can pass through your nose or mouth.
- Start the watch or begin counting from zero as soon as you close your mouth and nose.
- Continue holding your breath for as long as possible until you feel the urge to breathe again.
- 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.
Precautions:
- Perform this activity in a safe environment to avoid accidents or injuries.
- If you feel uncomfortable or experience any dizziness during the experiment, release your breath immediately and take a break.
- 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.
