Q1
What is excretion?
ARemoving waste products from the body
BOnly digesting food
COnly breathing in
DNothing useful
ICSEClass 7 (ICSE)ScienceCh 19 · Topic 1
Excretion in Humans
Excretion removes waste products from the body, mainly through the kidneys (urine), lungs (carbon dioxide), and skin (sweat).
Core concept
The kidneys filter blood to remove waste products, like urea, forming urine that is then stored in the bladder before being excreted.
How it works
The lungs excrete carbon dioxide, a waste product of respiration, when we breathe out.
Why it matters
The skin excretes waste through sweat, which also helps regulate body temperature by cooling us down.
Key detail
Proper excretion is essential for removing toxins and waste, keeping our internal body environment balanced and healthy.
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• Excretion removes waste products from the body.
• Kidneys filter blood to remove waste like urea.
• This forms urine, stored in the bladder.
• Lungs excrete carbon dioxide.
• This happens when we breathe out.
• Skin excretes waste through sweat.
• Sweat also helps regulate body temperature.
• Excretion keeps the body balanced and healthy.