Download All people and other animals are made of animal cells. Animal cells

All people and other animals are made of animal cells. Animal
cells come in many different shapes and sizes. You have over
200 different types of cells in your body, including muscle
cells, nerve cells, and blood cells. The different cells in your
body do different jobs. Nerve cells, for example, can have very
long and thin branching parts. Blood cells that carry oxygen
throughout your body are tiny and shaped like disks. Muscle
cells can contract, or change shape from long to short.
All cells have a cell membrane. The cell membrane
surrounds the cell and holds it together. The cell membrane
gives the cell its shape. It also controls what goes in and out of
the cell. The inside of a cell has a jelly-like liquid called
cytoplasm. Different structures called organelles float in the
cytoplasm. The organelles help a cell do its job. The nucleus
is the organelle that controls how the other parts of the cell
work.
Plants such as trees and grasses are made of plant cells. Plant
cells are similar to animal cells. They can have different shapes
and do different jobs. They have a cell membrane, cytoplasm,
organelles, and a nucleus, just like animal cells do. But plant
cells also have cell parts that animal cells do not.
Plant cells have a cell wall that surrounds their cell membrane.
The cell wall is thick and strong. It helps support a plant and protect
it from damage. If plant cells did not have cell walls, plants would
fall over instead of growing straight up. Together, the cell
membrane and cell wall controls what goes in and out of a plant
cell.