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Summary Die menslike senuweestelsel Lewenswetenskappe graad 12 opsomming R89,00
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Summary Die menslike senuweestelsel Lewenswetenskappe graad 12 opsomming

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Hierdie opsomming sluit in: struktuur van 'n neuron, klassifikasie van neurone, oordrag van senuwee-impulse, die sentrale senuweestelsel (SSS), die perifere senuweestelsel (PSS), en afwykings en beserings van die senuweestelsel.

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  • September 5, 2023
  • 14
  • 2023/2024
  • Summary
All documents for this subject (1241)
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emmagriesel
Sentrale senuweestelsel (SSS) Perifere senuweestelsel (PSS)
Bestaan uit brein en rugmurg Wat uit die senuwees wat senuwee-impulse na
en van die rugmurg en brein gelei, bestaan.
12 pare kop senuwees.
31 pare rugmurgsenuwees.


Stimulus Waarneming Verwerking en integrasie Reaksie

Senuwee-impulse Brein en rugmurg (SSS) Senuwee-impulse
word langs ‘n network Verwerk + integreer die inligting word langs ‘n network
senuweeselle vanaf senuweeselle vanaf
die reseptore na brein die brein en rugmurg
+ rugmurg gelei. tot by die effektore
gelei.

Reseptore
Effektore
Neem stimuli waar en skakel dit
Bv. Spiere of kliere
om in senuwee-impulse.
reageer op stimuli.




Stimuli Reaksie



, • ‘n Neuron besit ‘n selliggaam wat uit sitoplasma + ‘n prominente selkern bestaan.
• Die sitoplasma bevat donker korrels, die Nissl-korrels, wat ryk aan RNA is + by
proteïensintese betrokke is.
• Vanuit die selliggaam kan twee tipes uitlopers, die dendriete en aksone ontspring
• Dendriete: gelei senuwee-impulse na die selliggaam.
• Aksone: gelei senuwee-impulse weg van die selliggaam.
• Een of meer dendriete kan teenwoordig wees, afhangend vd. tipe neuron.
• Die akson vorm ‘n aantal takkies = eindvertakkings.
• Aan die punte van eindvertakkings kom sinapse knoppies voor.




Meeste senuweevesels buite
SSS is omsluit deur ‘n
miëlienskede, wat deur
schwannselle gevorm word




Monopolêre neuron Bipolêre neuron
Een uitloper, wat in twee vertak, ontspring uit die Twee uitlopers ontspring uit die
selliggaam. selliggaam, nl. ‘n akson en dendrite.




Multipolêre neuron
Baie uitlopers ontspring uit die selliggaam, nl. ‘n akson en groot
aantaal dendriete.




Neurone word ook op grond van hulle funksies geklassifiseer:
Sensoriese/afferente Motoriese/efferente Verbindings/interneurone
neurone neurone Verbind sensoriese en
Gelei senuwee-impulse Gelei senuwee-impulse motoriese neurone met mekaar
vanaf reseptore na SSS. weg van SSS na effektore in die SSS. Multipolêr.

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