How We Breathe
Class 7 Science: respiration in organisms
Move the diaphragm to breathe in and out, and see how breathing changes when you walk, run or sprint.
Words to know
- Diaphragm
- A sheet of muscle under the lungs that moves when we breathe.
- Inhalation
- Breathing in.
- Exhalation
- Breathing out.
- Aerobic respiration
- Releasing energy from food using oxygen.
- Anaerobic respiration
- Releasing energy without oxygen; in muscles it makes lactic acid.
Quick check
Answer 3 questions to check what you learned.
Try at home
Count your breaths for one minute while sitting. Then jog on the spot for a minute and count again. How much faster was it?