... chocolate, odors travel up through the nose to th

1
Nervous System

• Thinking Questions

2
Explain how the sense of smell relates to the
sense of taste in identifying a food such as
chocolate.
3
Explain how the sense of smell relates to the
sense of taste in identifying a food such as
chocolate .

• When saliva in your mouth mixes with the
  chocolate, odors travel up through the nose to
  the throat, and the olfactory cells are
  stimulated.

4
What is the main function of the peripheral
nervous system?
5
What is the main function of the peripheral
nervous system?

• To connect the central nervous system, or brain
  and spinal cord, with all parts of the body

6
Identify the following sensory receptors listed
as part of the ear, eye, tongue, or nose retina,
cochlea, eardrum, olfactory cells, cones, rods,
taste buds.
7
ear cochlea, eardrumeye retina, rods,
conestongue taste budsnose olfactory cells
8
If neurons don't touch each other, how do they
transmit impulses to each other?
9
When an impulse reaches the end of an axon in one
neuron, the axon releases a chemical that flows
across a space between two neurons called a
synapse. The chemical relays the impulse to the
dendrite of the next neuron.
10
Explain how the eardrum aids hearing.
11
Sound waves cause the eardrum to vibrate. These
vibrations then move through the hammer, anvil,
and stirrup, and then on to the cochlea, where
impulses are sent to the brain. The sounds vary
according to the vibration.
12
You go to a doctor for a checkup. He or she uses
a rubber hammer to hit your knee. Your leg jumps
when the doctor hits it. Trace the path the
sensory information followed when the doctor hit
your knee.
13
The sensory neurons in your knee sent impulses to
the interneurons in the spinal cord. The
interneurons relayed an impulse to the motor
neurons. The motor neurons transmitted a message
to the muscles in your leg, and your leg moved.
14
Why is it an advantage to you to have reflexes?
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Reflexes allow you to respond without having to
think about it. They protect you from harm.
16
Use numbers to order the steps that occur when
you run an iron over your hand accidentally.____
__ You aren't paying attention when you run the
iron over your hand.______ Muscles of your hand
contract, responding to the impulses.______ Inter
neurons relay impulses to motor
neurons.______ Motor neurons relay impulses to
muscles of your hand.______ Sensory neurons in
your hand send messages to interneurons.______ Yo
u pull your hand away from the iron and scream.
17
1, 5, 3, 4, 2, 6