system nerfau Flashcards

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1
Q

beth yw’r prif system nerfol?

A

ymenydd a madryddyn y cefn

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2
Q

beth yw’r organau synnwyr?

A

grwp o celloedd derbynydd sy’n canfod ysgogiadau penodol
rhoi gwybodaeth i’r cns gyda newrons.

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3
Q

e.g o ysgogiad?

A

cemegion, tymheredd, golau, sownd.

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4
Q

beth yw newronau?

A

celloedd nerfol sy’n adaptio’n cyflym i trawsyrru’r impylsau nerfol.

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5
Q

beth yw nerf?

A

grwp o newrons sy’n rhoi gwybdoaeth fel impwls trydanol mewn yr system nerfol

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6
Q

beth yw atgyrch?

A

ymateb awtomatig i ysgogiad gan yr corff
anwirfoddol
gwarchodiaeth rhag poen

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7
Q

enghreifftiau o atgyrchau?

A

withdrawal- tynnu i ffwrdd
blincio
pupil

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8
Q

pam ydy atgyrchau’n awtomatig?

A

impylsau ddim yn teithio trwy n= newronau yn yr ymenydd

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9
Q

pam ydy atgyrchau’n cyflym?

A

impylsau ddim ond yn croesi trwy dau synapses sydd gallu arafu yn yr madryddyn y cefn

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10
Q
A
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