BIO 669 QUIZ 2 QUESTIONS & VERIFIED
ANSWERS| GRADE A+| 100% CORRECT (NEW
2024/ 2025 UPDATE)
1. Neuron is composed of: cell body, dendrites, axon
2. Densely packed cell bodies in the CNS are called : nuclei
3. Densely packed cell bodies in the PNS are called : Ganglia
4. What are dendrites?: Receptive portions of the neuron; receives information
5. What do axons do?: Carry impulses away from the cell body
6. Is membrane potential about the inside of the cell or the outside?:
inside of the cell
7. What is an electrochemical gradient?:
describes the forces attect on ion
movement if allowed to become permeable a membrane
8. When does action potential start?: when a membrane is depolarized enough
that it triggers voltage-gated ion channels
9. What is a graded potential?: changes in membrane potential that decreases over
distance
What Is a refectory period?: a period immediately following stimulation that is
10.
unresponsive for some time.
Reduced sensitivity
11. What is myelin?: A segmented layer of lipid material, acts as insulation.
12. What is myelin called in the PNS?: Schwann cells
13. What are the nodes of Ranvier?: gaps/regular interruptions in the myelin shea
14.What is saltatory conduction?: The flow of ions between segments of myelin
rather than alone the entire length of the axon. Like playing leap frog.
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, 15. What is divergence?: ability of branching axons to influence many neurons
16. What is convergence?: Branches of numerous neurons converging on one or a few
neurons
17. Central Nervous System (CNS) is made up of: brain and spinal cord
18. Peripheral Nervous System (PNS) is made up of: cranial nerves and
spinal nerves
19. Afferent pathways are : ascending
20. Efferent pathways are : descending
What does the somatic nervous system do?: motor and sensory pathways
21.
that regulate voluntary motor control of the skeletal muscles
What does the autonomic nervous system do?: motor and sensory pathways
22.
that regulate the bodies internal environment through involuntary control or organ systems
What is Wallerian degeneration?: degeneration of a nerve fiber that has been
23.
separated by an injury or disease
2/6
ANSWERS| GRADE A+| 100% CORRECT (NEW
2024/ 2025 UPDATE)
1. Neuron is composed of: cell body, dendrites, axon
2. Densely packed cell bodies in the CNS are called : nuclei
3. Densely packed cell bodies in the PNS are called : Ganglia
4. What are dendrites?: Receptive portions of the neuron; receives information
5. What do axons do?: Carry impulses away from the cell body
6. Is membrane potential about the inside of the cell or the outside?:
inside of the cell
7. What is an electrochemical gradient?:
describes the forces attect on ion
movement if allowed to become permeable a membrane
8. When does action potential start?: when a membrane is depolarized enough
that it triggers voltage-gated ion channels
9. What is a graded potential?: changes in membrane potential that decreases over
distance
What Is a refectory period?: a period immediately following stimulation that is
10.
unresponsive for some time.
Reduced sensitivity
11. What is myelin?: A segmented layer of lipid material, acts as insulation.
12. What is myelin called in the PNS?: Schwann cells
13. What are the nodes of Ranvier?: gaps/regular interruptions in the myelin shea
14.What is saltatory conduction?: The flow of ions between segments of myelin
rather than alone the entire length of the axon. Like playing leap frog.
1/6
, 15. What is divergence?: ability of branching axons to influence many neurons
16. What is convergence?: Branches of numerous neurons converging on one or a few
neurons
17. Central Nervous System (CNS) is made up of: brain and spinal cord
18. Peripheral Nervous System (PNS) is made up of: cranial nerves and
spinal nerves
19. Afferent pathways are : ascending
20. Efferent pathways are : descending
What does the somatic nervous system do?: motor and sensory pathways
21.
that regulate voluntary motor control of the skeletal muscles
What does the autonomic nervous system do?: motor and sensory pathways
22.
that regulate the bodies internal environment through involuntary control or organ systems
What is Wallerian degeneration?: degeneration of a nerve fiber that has been
23.
separated by an injury or disease
2/6
