Biology Story Boards: Negative & Positive
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All this shopping is making me hungry!
These girls are hungry, so the brain is sending hormones (Ghrelin), to tell them they're hungry.
I'm starving too!
Negative Feedback Loop
Since the brain is telling them they're hungry, they decide to eat.
After eating a delicious meal, they feel full. That means their brains are sending the hormones called leptins to say that they shouldn't eat anymore.
I'm stuffed, let's go home and watch a movie.
Home Sweet Home
2 Hours Later
I'm hungry again . . .
After watching a movie, they start feeling hungry again. That's the brain's way of saying that it needs more energy. Better get some food!
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