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The stems of plants are tissues; the human heart is Red blood cells (left), a single-celled paramecium
an organ. (center), and an amoeba (right) don’t look the same.
But they are all cells.
What’s Inside of a Every
Cell?
Although these pictures look very
Take a look at your friends, and different, they are all pictures of
the other kids in your cells. Even though cells look very
neighborhood. You probably notice different on the outside, these
that even though you are all kids, cells, just like people, do have
and maybe even all about the some things in common. In fact,
same age, you look pretty there are three things that every
different. Even though we look cell in the world has.
different on the outside though, we
First, every cell has a cell
know are made of a lot the same
membrane. The cell membrane is
things, like bones, muscles, and
made of lipids, which are fat
organs, on the inside. It’s the
molecules. The cell membrane is
same with cells. Look back at the
located along the edge of the cell,
picture of the nerve cell in the last
and has a job like a security guard.
section. Now look at the three
It allows things the cell needs to
pictures below.
get into the cell and keeps out
things that could hurt the cell.
The cell membrane acts like a guard, only letting
certain things into the cell.
The second thing all cells have is
cytoplasm. Cytoplasm is all the
material inside the cell membrane.
Cytoplasm is made of a watery
material called cytosol. Many
structures are found inside
cytoplasm. These tiny structures
are called organelles. We will
study some of the organelles later.
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