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Bio 227 Exam 4 Questions And Already Passed Answers.

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  • Biology 227
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  • Biology 227

Functions of the nervous system - Answer 1. Sensory 2. Integrative 3. Motor CNS contains what - Answer 1. Brain 2. Spinal Cord PNS contains? - Answer Cranial nerves and spinal nerves. Afferent System - Answer sensory (going into CNS) usually unipolar Efferent - Answer ...

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  • November 9, 2024
  • 19
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Biology 227
  • Biology 227
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Bio 227 Exam 4 Questions And Already
Passed Answers.
Functions of the nervous system - Answer 1. Sensory

2. Integrative

3. Motor



CNS contains what - Answer 1. Brain

2. Spinal Cord



PNS contains? - Answer Cranial nerves and spinal nerves.



Afferent System - Answer sensory (going into CNS) usually unipolar



Efferent - Answer Motor (exiting CNS)



Somatic Nervous System (SNS) - Answer voluntary , motor



Autonomic Nervous System (ANS) - Answer involuntary, motor



Sympathetic division - Answer fight or flight response.



Parasympathetic division - Answer rest and digest



Cerebrospinal Nervous System - Answer voluntary



Neurgolia - Answer glia cells "nerve glue"

Support and protect, smaller than neurons. Out number neurons -10 times. Jobs: clean up ions, looking
at action potentials, bring in food etc.

,Astrocytes - Answer Star cells, founded within the CNS, most abundant and most versatile glial cell of
CNS, form blood-brain barrier along with blood vessels endothelium, around pia mater, around neurons.



Duramater - Answer what is around the spine. tough layer.



Racniodmater - Answer spider-web-like layer



Peiamater - Answer thin ceran wrap, nooks and cranny layers



Oligodendrocytes - Answer Few tree, found within the CNS, form myelin sheaths around axons in CNS.
Myelin--phopholipids. One cell to many axons.



Myelin is what color - Answer white



Unmyelinated is what color - Answer gray



Microglial Cells - Answer small glue, found within the CNS, small cells with thorny processes, from
mesoderm, derived from monocytes, brain macrophages



Ectoderm - Answer give rise to end (enamel of teeth)



Mesoderm - Answer give rise to the middle stuff (bone, muscles, circulatory system, blood cells,
organs)



Endoderm - Answer the lining of your digestive system and the lining of respiratory system



Monocytes - Answer split out and swell



Ependymal Cells - Answer - Upper garment

, - found within the CNS

- form a continuous lining for ventricles of brain and central canal of the spinal cord

- may have cilia

- squamous to columnar

- associated with the choroid plexus which forms CSF (cerebral spinal fluid)



Schwann Cells (neurolemmacytes) - Answer found in PNS, forms myelin sheaths around axons, once
cell to one axon



Satellite Cells - Answer surround neuron cell bodies within ganglia.



Neurons - Answer nerve cells; structural and functional units of the nervous system



Structure of a neuron - Answer cell body, soma, perikaryon, contain cell organelles such as Nissl bodies
(chromatophillic rough ER) and inclusions. Only local potentials



Dendrites - Answer highly branched, thick extensions of cytoplasm, nissl bodies, can only do local
potentials



Axon (axis cylinder) - Answer Single, specialized, long, thin process

- Conducts impulse away form cell body

- Axoplasm

- Axolemma

- Axon collaterals

- Axon terminals (telodendria)

-Axoplasmic flow (slow, conveys info down to axon terminals)

-Axonal transport (faster, conveys info in both directions; microtubules & microfilament tracks; herpes,
rabies.)

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