Lees die uittreksel hieronder - NSC Life Sciences - Question 3 - 2023 - Paper 1
Question 3
Lees die uittreksel hieronder.
ALZHEIMERSIEKTE EN OEFENING
Ouderdom en familiesiekte is die bekende risikofaktore vir Alzheimer-siekte. Die algemene simptome van A... show full transcript
Worked Solution & Example Answer:Lees die uittreksel hieronder - NSC Life Sciences - Question 3 - 2023 - Paper 1
Step 1
Identifiseer: (a) Organ X
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Answer
Organ X is die nier.
Step 2
Identifiseer: (b) Die stelsel waaraan die bynier behoort
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Answer
Die bynier behoort aan die endokriene stelsel.
Step 3
Noem TWEE eienskape van die tipe kliere wat aan die stelsel behoort wat in VRAAG 3.2(b) gedefinieer is.
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Die strel hormone vry.
Dit stel hormone direk in die bloedvloeisels vry.
Step 4
Beskryf die interaksie tussen die bynier en organ X om homeostase in stand te hou wanneer soutvlakke in die liggaam laer is.
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Die bynier stel aldosteron vry om die nieren te stimuleer om meer natrium terug in die bloed te reabsorbeer, wat die soutvlakke in die bloed verhoog.
Step 5
Verduidelik die effek wat 'n afskakeling van die pieïtuitêre kliere op organ X sal hê wanneer 'n persoon dehydriseer.
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Die afskakeling van die pituitêre kliere sal die skeiding van ADH stop, wat lei tot 'n verhoogde urienaanslag en dus 'n afname in water in die liggaam.
Step 6
Noem die: (a) Termoregulering
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Termoregulering is die proses waardeur die liggaam sy temperatuur reguleer.
Step 7
Noem die: (b) Hipotalamus
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Die hipotalamus is 'n deel van die brein wat die liggaam se temperatuur reguleer.
Step 8
Bereken die persentasie afname in die gemiddeld temperatuur vanaf 37.4 °C.
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Die afname is:
rac{(37.4 - 35.4)}{37.4} imes 100 ext{%} = 5.35 ext{%}
Step 9
Identifiseer die volgende dele vanaf die diagram: (a) P
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P is die kapillêre of bloedvaten.
Step 10
Identifiseer die volgende dele vanaf die diagram: (b)
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Q is die sweetklier.
Step 11
Verduidelik die rol van deel P en Q in die verandering in veltempertuur wanneer oefening onderneem word.
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Wanneer oefening plaasvind, neem die hitteproduksie toe, wat meer sweet toelaat as gevolg van aktivering van Q, wat die liggaam help om oortollige hitte te verloor deur transpirasie.
Step 12
Verduidelik waarom al die plante aan dieselfde omgewingsfaktore blootgestel is.
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Alle plante is aan dieselfde omgewingsfaktore blootgestel om te verseker dat die resultate in verband met die groei van die plante soortgelyk kan wees.
Step 13
Noem TWEE onafhanklike veranderlikes.
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