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Cells and microbes
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It lets in substances that are useful to the cell.
The cell membrane works like the doors that only let people in to a sports match if they have a ticket!
Then it goes into the lungs and animals breathe it out.
When there’s more waste carbon dioxide inside a cell than outside it, the carbon dioxide moves out of the cell.
When there’s more oxygen in an animal’s blood than in its other cells, the oxygen moves from the blood into other cells.
This is when a substance moves from where there’s more of that substance to another place where there’s less of it.
Most substances move into a cell by diffusion.
The cell membrane has little holes that let in substances that are useful to the cell.
Root hair cells collect most of the water that the plant needs and uses.
The cell membranes on root hair cells are very thin so that water can go through them easily.
They grow from the root into the soil.
These cells are very long.
Plant roots have a type of cell called a root hair cell.
The cell membrane lets carbon dioxide and other waste leave the cell.
During respiration, cells make waste carbon dioxide.
All chemical reactions make waste.
It lets oxygen and sugar come into the cell for respiration.
The cell membrane controls what goes in and out of every cell.
So animals start to breathe faster to take in more oxygen for respiration.
These cells need more energy from food so that they can keep working.
When animals move very fast, like when people run in a race or play a fast game of soccer, their muscle cells use a lot of energy.
People and other animals take in oxygen by breathing it in through their mouth or nose.
Plants take in oxygen for respiration through the stomata holes on their leaves.
Plant and animal cells use oxygen from the air for respiration.
There’s only very little oxygen in water at the bottom of the ocean. Microbes that live here can get energy from their food without oxygen.
When living things use oxygen to release energy from food, it’s called respiration.
These reactions release energy from food.
Inside the mitochondria, chemical reactions happen between oxygen and sugar.
Cells that use a lot of energy, like the cells in muscle tissue and nerve tissue, have a lot of mitochondria.
Mitochondria are tiny parts inside the cytoplasm of all cells, and they take energy from food.
Plants, animals, and microbes need energy to stay alive. The cells of all living things take this energy from food.
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