- | Page
BIO 253 EXAM 2 LATEST ACTUAL EXAM 100
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES |AGRADE
Question 1: What does a central nervous system consist of
CORRECT ANSWER : Brain and spinal cord
Question 2: What is the function of the CNS
CORRECT ANSWER : Integrated control center
Question 3: What does a PNS consist of
CORRECT ANSWER : Cranial and spinal nerves
Question 4: What is the function of the PNS
CORRECT ANSWER : Communication lines between CNS and
the rest of the body
Question 5: What sends impulses to the PNS
CORRECT ANSWER : Sensory division (afferent)
Question 6: What sends impulses from CNS to effector (muscles
or glands)
- | Page
CORRECT ANSWER : ...efferent
Question 7: Autonomic nervous system
CORRECT ANSWER : Involuntary (visceral motor)
Conducts impulses from CNS to cardiac muscles, smooth muscles, and glands
Question 8: Somatic nervous system
CORRECT ANSWER : Voluntary
Conducts impulses from CNS to skeletal muscle
Question 9: Local potential (receptor potential) what does it do
CORRECT ANSWER : Stimulates gated sodium ion channel
Question 10: What do you need to do for stimulated gates to
open
CORRECT ANSWER : Cell needs to reach threshold
Question 11: Can you stimulate neuron during absolute
refractory period or hyperpolarization
CORRECT ANSWER : No
- | Page
Question 12: Can you stimulate neuron during relative
refractory time
CORRECT ANSWER : Yes but you need a powerful stimulus
Question 13: Refractory period
CORRECT 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
Question 14: What is a cell like at rest
CORRECT ANSWER : Sodium on the outside and potassium
inside
Question 15: Layers of the external ear
CORRECT ANSWER : Auricle or pinna
External acoustic meatus Temporal bone
- | Page
Question 16: Middle ear structure
CORRECT ANSWER : Tympanic membrane
Malleus, incus, stapes (the 3 ear ossicles) Auditory tube
Question 17: Inner ear structure
CORRECT ANSWER : Semicircular canals
Cochlea Vestibule