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Animal cells, unlike plant cells, do not have chloroplasts which contain chlorophylls or light-absorbing pigments. And unlike plant cells, animal cells do not have a cell wall but, rather a cell membrane.
A cell membrane is a very thin layer of protein and fat that surrounds the outside of the cell. Because it is so thin, it allows substances (such as food and oxygen) to pass in and out of the cell. Inside of the cell membrane are many tiny structures known as organelles.
The nucleus is the very center of the cell and acts as the brain of the cell. It is, in essence, the cell’s control center.
Animal cells have centrioles. They also contain organelles such as endoplasmic reticulum (smooth and rough), mitochondrion, Golgi apparatus, plasma membrane, microtubules and microfilaments, lysosomes and a nucleus.
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