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Air and the respiratory system
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How does gas exchange in our lungs take place?
The inhaled oxygen will pass through the wall of blood vessels and enter the blood stream while carbon dioxide from the blood moves out into the lungs.
In most plants, stomata are found mainly on the underside of leaves. This is to prevent
water loss or water inside the plant from evaporating too quickly
True or False: Plants can make food when there is no light.
false
Plants make food by _______________.
photosynthesis
How do plants take in and give out air?
tiny openings called stomata
How do worms breathe?
moist skin
How do frogs breathe?
lungs and moist skin
How do insects breathe?
breathing holes/body openings
How do mammals like dolphins and whales breathe?
blowholes
How do fish take in and give out air?
gills
The _________ in the nostrils remove dust from the air we breathe in.
hairs
3 main parts of our respiratory system
nose, windpipe and lungs
In the lungs, the air tubes branch into tiny tubes that end in air sacs. The air sacs are surrounded by blood vessels. What important process takes place in the air sacs?
gas exchange
What happens to our breathing rate when we exercise?
faster, increase
__________________ is the process by which air enters and leaves our body.
Breathing
How do humans get oxygen?
breathing
The carbon dioxide given out by the animals is used up by the ____________.
plants
The type of gas needed by living things such as animals to stay alive.
oxygen
It is the most abundant type of gas in the air. About 78% of air is made up of it.
nitrogen
What is air made up of?
nitrogen, oxygen, carbon dioxide, water vapour and other gases.


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