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I need help on Science homework. i cant think of the answers to these questions

1) How do Myelin Sheath help Motor and/or sensory neurones do there jobs

2) Suggest why a shortage of transmitter substance could cause alzeimers disease

3) Suggest 2 ways that an animal would be affected if it was shot by an arrow tipped with cucare

4) Suggest 2 effects that a bite from a black widow spider would have on a victim

4) Death?

4.
death
coz of paralisation of nervous system (CNS)
and the problems of breathing
more or less

that isnt enough i have to explain how death and parailisation is caused

one moment please...

anyone?

black widow
Latrodectus mactans mactans

neurotopic (?) type of poison
the contraction of muscles and the lack of concious

Thanks clovie!!!

i only need answers to 2 of those questions now:

2) Suggest why a shortage of transmitter substance could cause alzeimers disease

3) Suggest 2 ways that an animal would be affected if it was shot by an arrow tipped with cucare

np. I just had to find biology notes from last year

and as for point 3 i think the substance is called curare...not cucare but still no idea how it works.

yea sorry. mistype