Solved by a verified expert:BioLab3
Nervous System
Lab Report
Student Name:
I.
Neuron
EXERCISE
1– Neuron
Identify and label
the structures of the neuron.
A.
B.
C.
D.
E.
F.
Identify and label
the structures of the reflex arc.
A.
B.
C.
D.
E.
F.
II. Central Nervous System
EXERCISE
2– Spinal cord
Identify and label
the structures of the spinal cord.
A.
B.
C.
D.
Identify and label
the connections of the sensory neuron, spinal cord, and motor neuron.
A.
B.
III.
Reflex
EXERCISE
3– Tendon reflex
·
Observation:
·
Is the subject aware of the
stimulus?
·
Is the subject aware of the
response?
·
Observation:
EXERCISE
4– Pupillary Reflex
·
Observation:
·
Observation:
·
Which is faster: constriction
or dilation of the pupils?
·
Is the subject aware of the
pupils changing diameter?
EXERCISE
5– Swallowing
·
Do you have conscious control
over all of these muscles?
·
Is it possible to swallow
several times in quick succession?
·
What effect does the stimulus
have on the ability to swallow in quick succession?
·
What part of swallowing is
controlled by the conscious mind?
·
What part is a reflex?
IV. Reaction
EXERCISE
6– Reaction Time
Record
results of the ruler reaction experiment.
Trial
Distance (cm)
Trial
Distance (cm)
1
6
2
7
3
8
4
9
5
10
·
Was there a change in reaction time during
the ten trials?
·
What do you think accounts for any changes
that were observed?
V.
Sensations
EXERCISE 7– Skin
receptors
Identify and label
the structures of the skin receptors.
A.
B.
C.
D.
E.
EXERCISE 8– Skin
sensations and modality
What is the total
number of positive responses for each stimulus?
Touch
Pain
Cold
Heat
·
What is the pattern of distribution of
positive responses?
EXERCISE 9– Projection
·
Describe any sensations that are felt after
the bag is removed.
·
What can you conclude about projection and
the receptors on the surface of the hand
and forearm?
EXERCISE 10– Adaption using water
temperature
Record the
sensations of hands in beakers 1 and 3.
Time
Right hand
in beaker 1
Left hand
in beaker 3
Initially
After
15 s
After
30s
After
45s
After
60s
Record the
sensations of hands in in beaker 2.
Right
hand
Left
hand
EXERCISE 11– Adaption
using a coin
Record the time
that the sensation persists for the subject.
Seconds:
Record the time
that the sensation persists at the second location.
Seconds:
·
Does the pressure sensation return?
If so, record the
time (in seconds) that the subject aware of this pressure?
Seconds:
Summary Questions
1.
What is the name of the axon covering that
aids in the transmissionof a nerve impulse over
long distances?
2.
Which type of neuron carries messages from
receptors to the central nervous system?
3.
Which type of neuron carries messages
within the central nervoussystem?
4.
Which skin receptor detects light pressure?
5.
What name is applied to the sacs within the
axon terminal that contain neurotransmitters?
6.
Define the following terms and describe an
experiment that demonstrates each one:
Modality:
Projection:
Adaptation:
7.
List and describe the different classes of
neurons in terms of function.
8.
Name and describe the function of five
types of sensory receptors found in the skin.
9.
List two differences between a reflex and a
reaction
10.Name a
difference between the tendon reflex and the pupillary reflex.
11.Describe
the contents of the gray and white matter in the spinal cord.
12.Describe
the components of a simple reflex arc.
13.What do
you think an advantage and a disadvantage of receptor adaptation would beto
a person?
14.Are
organisms aware of all the activity in their nervous system? Why is this an
advantage?
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