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In this activity about the baroreceptor reflex (BR) arc (page 123 of the PDF), learners discover the importance of maintaining adequate arterial blood pressure through a role playing exercise.

1 cent - $1 per group Ages 8 - 18 45 to 60 minutes
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In this activity, learners discover that it's difficult to distinguish between two different shades of gray when they aren't separated by a boundary.

$1 - $5 per group Ages 8 - 14 5 to 10 minutes