Bio 253 Exam 2 Frequently Tested Actual Questions With Correct Answers

BIO 253 EXAM 2 FREQUENTLY TESTED ACTUAL
QUESTIONS WITH CORRECT ANSWERS
Question 1.
What does a central nervous system consists of

ANSWER
Brain and spinal cord



Question 2.
What is the function of the CNS

ANSWER
Integrated control center



Question 3.
What does a pns consist of

ANSWER
Cranial and spinal nerves



Question 4.
What is the function of the pns

ANSWER
Communication lines between CNS and the rest of the body



Question 5.
What sends impulses to The pns

ANSWER
Sensory division (afferent)



Question 6.
What sends impulses from CNS to effector (muscles or glands)

ANSWER
...efferent




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, Question 7.
Autonomic nervous system

ANSWER
Involuntary (viseral motor) Conducts impulses from CNS to cardiac muscles smooth muscles and
glands



Question 8.
Somatic nervous system

ANSWER
Voluntary Conducts impulses from CNS to skeletal muscle



Question 9.
Local potential (receptor potential) what does it do

ANSWER
Stimulates gated sodium ion channel



Question 10.
What do you need to do for stimulated gates to open

ANSWER
Cell needs to reach threshold



Question 11.
Can you simulate neuron during absolute refractory period or hyperpolarization

ANSWER
No



Question 12.
Can you simulate neuron during relative refractory time

ANSWER
Yes but you need a powerful stimulus



Question 13.
Refractory period

ANSWER
During depolarization sodium ions go inside During repolarization potassium leaves Hyperpolarization
needs to be fixed by an exchange and ions so it can rest




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