Chapter 15: Support, Movement, and Responses - Science
Chapter 15: Support, Movement, and Responses - Science
Chapter 15: Support, Movement, and Responses - Science
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Goals<br />
■ Observe the sensitivity<br />
to touch on specific<br />
areas of the body.<br />
■ Design an experiment<br />
that tests the effects of<br />
a variable, such as how<br />
close the contact points<br />
are, to determine<br />
which body areas can<br />
distinguish which stimuli<br />
are closest to one<br />
another.<br />
Possible Materials<br />
3-in 5-in index card<br />
toothpicks<br />
tape<br />
*glue<br />
metric ruler<br />
*Alternate materials<br />
Safety Precautions<br />
WARNING: Do not apply<br />
heavy pressure when<br />
touching the toothpicks<br />
to the skin of your<br />
classmates.<br />
Design Your Own<br />
458 CHAPTER <strong>15</strong> <strong>Support</strong>, <strong>Movement</strong>, <strong>and</strong> <strong>Responses</strong><br />
(t)Jeff Greenberg/PhotoEdit, Inc., (b)Amanita Pictures<br />
Skin Sensitivity<br />
Real-World Question<br />
Your body responds to touch, pressure, temperature,<br />
<strong>and</strong> other stimuli. Not all parts of your body are<br />
equally sensitive to stimuli. Some areas are more<br />
sensitive than others are. For example, your lips are<br />
sensitive to heat. This protects you from burning<br />
your mouth <strong>and</strong> tongue. Now think about touch.<br />
How sensitive to touch is the skin on<br />
various parts of your body ? Which areas<br />
can distinguish the smallest amount of<br />
distance between stimuli?<br />
Form a Hypothesis<br />
Based on your experiences, state a hypothesis about which of the following<br />
five areas of the body—fingertip, forearm, back of the neck,<br />
palm, <strong>and</strong> back of the h<strong>and</strong>—you believe to be most sensitive. Rank<br />
the areas from 5 (the most sensitive) to 1 (the least sensitive).