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LATEST A!empt 1 90 minutes 117 out of 140
Score for this quiz: 117 out of 140
Submi!ed Mar 9 at 10:37pm
This a!empt
... [Show More] took 90 minutes.
Ques!on 1 2 / 2 pts
The neuron pictured, below, is best described as:
A&P2 M1 Exam- page 2a.png
Bipolar
Mul"polar Correct!
Unipolar
Pseudounipolar
Your Answer:
Ques!on 2 10 / 10 pts
Name and describe what is occurring in the neuron cell membrane in sec"on 2 of the
diagram. Include the charge of the membrane during this phase.
Depolariza"on, sodium gates are opened and the sodium floods into the axon amidst
the depolariza"on of the ac"on poten"al, causing the charge voltage to go from zero
to +40 mV.
Depolariza!on: The sodium gates open and sodium rushes into the axon
during the depolariza!on phase of the ac!on poten!al.
Voltage travels past zero and then on up to +40 mV.
Your Answer:
Ques!on 3 0 / 4 pts
This part of a reflex is inside the CNS, made up of one or more synapses.
Interneurons, flexor withdrawal reflex or the reflex arc.
Integra!on center
Ques!on 4 4 / 4 pts
What is true about the flexor withdrawal reflex?
A. It does not involve interneurons.
B. It involves excitatory interneurons.
C. It involves inhibitory interneurons.
D. The effect of the reflex is to create a co-contrac"on of two muscles
E. A&D
F. B&C Correct!
Your Answer:
Ques! 10 / 10 pts on 5
Label the nerves (A-C) in the figure below:
A: _________________
B: _________________
C: _________________
A. lateral femoral cutaneous nerve
B. Femoral nerve
C. Saphenous nerve
A- Lateral femoral cutaneous
B- Femoral nerve
C- Saphenous
Ques!on 6 0 / 2 pts
Which of the following is most likely a symptom of ALS?
Impaired ability to swallow Correct Answer
Decreased sensa"on in the hands
Shrinkage of cerebral cortex
Increased size of brain ventricles
All the above You Answered
Your Answer:
Ques!on 7 4 / 4 pts
What is the purpose of the blood-brain barrier? Describe its maintenance from a
cellular level.
it is a diffusion barrier that aids in the preven"on of unwanted materials ge$ng inside
of the CNS by keeping the brain and the spinal cord apart from the general blood
supply. It is made up of the glial cells astrocytes and it is imporant for regula"on to be
kept up at all "mes to keep a stable environment which is paramount for protec"ng
the neurons.
The blood-brain barrier is a diffusion barrier which prevents most par!cles
from entering the central nervous system !ssue, keeping the brain and spinal
cord separate from general blood circula!on. The blood-brain barrier is
formed by the rela!vely impermeable brain capillaries, due to the glial cells
astrocytes. Maintenance of the blood-brain-barrier is important to provide a
stable chemical environment for the nervous system [Show Less]