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Biology
Jones
Name:
Period:
Date:
Nervous System Round-A-Bout
 Activity 1: How Many Points Are Touching?
1. How many mistakes did you make? _____________
2. Where was it easiest to tell how many tips were touching?
3. Explain how the structure of dendrites relate to their function.
4. Form a hypothesis as to why more mistakes were made as your partner moved up the arm.
Think!
5. Explain the relationship between the structure of an axon and its function. Describe the
direction of an impulse through the axon of the neurons in your arm.
 Activity #2: How Fast Can You React?
# of tries
Before
After
Difference
Average
(of Diff.)
Trial 1 = Sight
1
2
3
Trial 2 = Hear
1
2
3
Trial 3 = Touch
1
2
3
1. Where did the initial stimulus come from in the first trial? The second trial? The third trial?
2. How do the different stimuli compare in your reaction time?
3. Defend why you think sight, hearing, or touch is a more valuable sense.
4. Using the concept of a reflex arc, explain how your finger muscle received the order to catch
the stick. Explain the functions of sensory neuron and motor neuron in your answer; your answer
should also include the terms: stimulus, reflex arc, afferent, and efferent. Use complete,
logical sentences!
 Activity #3: The Uncontrollable Foot
1. Observations:
A. Right foot clockwise:
B. Left foot clockwise:
C. Right foot counterclockwise:
D. Left foot counterclockwise:
2. Are you right handed or left handed? ____________________________
3. When moving your foot in a clockwise direction was it easier to do it with your right foot or
left foot while drawing the number 6?
4. If you are right handed, hypothesize why it was difficult to rotate your right foot in a
clockwise direction? Think about your cerebral hemispheres! (If you are left handed, answer
the question from this prospective,… left foot,…)
5. Describe how your cerebellum helped you with this activity.