1
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The muscle cell is the cell that has the dark muscle.

2
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It's different than the cells from the brain, for example.

3
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The tissue, the muscle tissue, is the result of many muscle cells together.

4
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When you have many tissues, you get an organ. This is the heart.

5
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The organ system is the union of many organs.

6
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When many organ systems join, we have a body system.

7
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In this case, the body system of a cat.

8
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We hope you understand. Bye!

9
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Bye.

10
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Bye.

11
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Bye-bye.