UNIT 6 THE HUMAN BODY
Measuring how fast someone
responds to what they see- Hold a ruler near the end
(highest number) and let it
hang down. - Have a partner put their hand
at the bottom of the ruler and
ready to grab it. They should
not be touching the ruler. - Tell your partner that you will
drop the ruler sometime within
the next 5 seconds. They
should catch the ruler as fast
as they can after it is dropped. - Record the place on the ruler
where they catch it, in cm. - Test the same person 3 to 5
times. Vary the time of
dropping the ruler within the 5
second "drop-zone" so the
other person cannot guess
when you will drop the ruler. - Design an experiment to test
one of the following questions:
- Does the amount of light affect
response? - Who responds faster, girls or
boys? - Does age affect response?
18.1 Section Review
- Define each category of the nervous system:
a. central nervous system
b. peripheral nervous system - Explain how a nerve impulse is both electrical and chemical.
- Classify each as voluntary, involuntary, or both. If the action
can be both, explain how.
a. the beating of your heart muscle
b. breathing
c. raising your arm
d. lifting a rock
e. blinking your eyes
f. movement of muscles in your digestive system - The diagram below shows a neuron. Name the function of each
of its parts. - The brain and spinal cord are made of two tissues. Name those
tissues and explain their function. - Match each brain structure to one of its functions.
Structure Function- medulla a. controls involuntary breathing
- cerebrum b. detects the position of the body in space
- cerebellum c. controls imagination