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Endocrine System

Outline of a person with the hypothalamus in their brain highlighted. 98.6 degrees. Caption: The hypothalamus monitors the temperature inside the body
22 minutes 42 seconds
Grade Level: 5 - 10
Microscopic view of small, tube-like structures. Caption: Two kinds of cells make up the living world:
15 minutes 44 seconds
Grade Level: 9 - 12