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Thinking Scientifically
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1. Considering the nerve impulse, electricity is the flow of electrons within a wire.
a. How is the nerve impulse different from this?

Answer

b. If a neurotransmitter substance is inhibitory, would you expect a higher or lower voltage reading compared to -65mV on the oscilloscope?

Answer

c. In the laboratory, an axon segment can conduct a nerve impulse in either direction. Why do nerve impulses go only from axon bulb to dendrite or cell body across a synapse in the body?

Answer

d. Nerves cause muscles to contract. Assuming one nerve fiber per one muscle fiber of a muscle, explain how a nerve can bring about degrees of muscle contraction.

Answer

2. Considering a reflex arc:
a. If you applied acid to the left leg of a frog, why might both legs respond?

Answer

b. If you severed just the dorsal root ganglion of the left sciatic nerve that serves the leg, would either leg be able to respond?

Answer

c. If you severed just the ventral root of the left sciatic nerve, would either leg be able to respond?

Answer

d. If you destroyed just the spinal cord, would either leg be able to respond?

Answer







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