BIO 253 EXAM 2 UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS
VERIFIED 2027 EDITION
1. What does a central nervous system consists of
Brain and spinal cord
2. What is the function of the CNS
Integrated control center
3. What does a pns consist of
Cranial and spinal nerves
4. What is the function of the pns
Communication lines between CNS and the rest of the body
5. What sends impulses to The pns
Sensory division (afferent)
6. What sends impulses from CNS to effector (muscles or glands)
...efferent
7. Autonomic nervous system
Involuntary (viseral motor) Conducts impulses from CNS to cardiac muscles smooth muscles and glands
8. Somatic nervous system
Voluntary Conducts impulses from CNS to skeletal muscle
9. Local potential (receptor potential) what does it do
Stimulates gated sodium ion channel
10. What do you need to do for stimulated gates to open
Cell needs to reach threshold
11. Can you simulate neuron during absolute refractory period or hyperpolarization
No
12. Can you simulate neuron during relative refractory time
Yes but you need a powerful stimulus
13. Refractory period
During depolarization sodium ions go inside During repolarization potassium leaves Hyperpolarization
needs to be fixed by an exchange and ions so it can rest
1
, 14. What is a cell like at rest
Sodium on the outside and potassium inside
15. Layers of the external ear
Auricle or pinna External acoustic meatus Temporal bone
16. Middle ear structure
Tympanic membrane Malleus, incus ,stapes (the 3 ear ossicles) Auditory tube
17. Inner ear structure
Semicircular canals Cochlea Vesible
18. Cranial nerves
19. What does the cochlea do
Provide hearing
20. What does the vestible do?
Provide equilibrium (balance)
21. Inner eye structure
Retina
22. Middle eye structure
Vascular layer such as the choroid layer
23. Outer eye layer
Fibrous layer such as schlera or the cornea
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VERIFIED 2027 EDITION
1. What does a central nervous system consists of
Brain and spinal cord
2. What is the function of the CNS
Integrated control center
3. What does a pns consist of
Cranial and spinal nerves
4. What is the function of the pns
Communication lines between CNS and the rest of the body
5. What sends impulses to The pns
Sensory division (afferent)
6. What sends impulses from CNS to effector (muscles or glands)
...efferent
7. Autonomic nervous system
Involuntary (viseral motor) Conducts impulses from CNS to cardiac muscles smooth muscles and glands
8. Somatic nervous system
Voluntary Conducts impulses from CNS to skeletal muscle
9. Local potential (receptor potential) what does it do
Stimulates gated sodium ion channel
10. What do you need to do for stimulated gates to open
Cell needs to reach threshold
11. Can you simulate neuron during absolute refractory period or hyperpolarization
No
12. Can you simulate neuron during relative refractory time
Yes but you need a powerful stimulus
13. Refractory period
During depolarization sodium ions go inside During repolarization potassium leaves Hyperpolarization
needs to be fixed by an exchange and ions so it can rest
1
, 14. What is a cell like at rest
Sodium on the outside and potassium inside
15. Layers of the external ear
Auricle or pinna External acoustic meatus Temporal bone
16. Middle ear structure
Tympanic membrane Malleus, incus ,stapes (the 3 ear ossicles) Auditory tube
17. Inner ear structure
Semicircular canals Cochlea Vesible
18. Cranial nerves
19. What does the cochlea do
Provide hearing
20. What does the vestible do?
Provide equilibrium (balance)
21. Inner eye structure
Retina
22. Middle eye structure
Vascular layer such as the choroid layer
23. Outer eye layer
Fibrous layer such as schlera or the cornea
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