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Subject: nervous system & electrolytes Author: Bronwyn [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 14:10:05 07/26/01 Thu This is a fictional scenario based on truth. New people (Elizabeth & Jo) can think about this too but may wish to come back to it later. Ms M has been experiencing diarrhoea for several days possibly related to some dubious smelling fish she ate. She has been drinking plenty of water to prevent dehydration but this morning could hardly get out of bed. She was feeling very weak and her legs barely held her upright. Question 1 - how may the diarrhoea have altered Ms M's electrolyte balance? Question 2 - If an electrolyte imbalance has occurred how might this affect muscle function? Hint: - think nerve impulses & what is needed for normal action potentials. [ Next Thread | Previous Thread | Next Message | Previous Message ]

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[> Subject: Re: nervous system & electrolytes Author: Jill [ Edit | View ] Date Posted: 21:30:46 08/17/01 Fri >A gastric infection from contaminated food is frequently identified by the passing of loose frequent stools. This is in part due to the lining of the system being damaged or irritated by the infection presence and food moving through with a minimal of fluid reabsorption. The excess fluid excreted needs to be replaced to avoid dehydration and consequent electrolyte imbalances. 2. Voluntary muscle control is governed by nerve impulses travelling from brain to indiviual muscles. To effect movement, the impulse relies on a Na+ and K+ balance to hold a stable state till the nerve impulse comes in a wave like action, of local depolarisation and repolarisation. Dehydration from excess fluid loss can result in a lack of Na+ thus altering the balance and interferring with Mrs S's ablity to stand steadily This is a fictional scenario based on truth. New >people (Elizabeth & Jo) can think about this too but >may wish to come back to it later. > >Ms M has been experiencing diarrhoea for several days >possibly related to some dubious smelling fish she >ate. She has been drinking plenty of water to prevent >dehydration but this morning could hardly get out of >bed. She was feeling very weak and her legs barely >held her upright. > >Question 1 - how may the diarrhoea have altered Ms M's >electrolyte balance? > >Question 2 - If an electrolyte imbalance has occurred >how might this affect muscle function? > >Hint: - think nerve impulses & what is needed for >normal action potentials. [ Post a Reply to This Message ]

[> Subject: Re: nervous system & electrolytes Author: Jill [ Edit | View ] Date Posted: 21:34:23 08/17/01 Fri Ooops. Ms M became Mrs S..... >This is a fictional scenario based on truth. New >people (Elizabeth & Jo) can think about this too but >may wish to come back to it later. > >Ms M has been experiencing diarrhoea for several days >possibly related to some dubious smelling fish she >ate. She has been drinking plenty of water to prevent >dehydration but this morning could hardly get out of >bed. She was feeling very weak and her legs barely >held her upright. > >Question 1 - how may the diarrhoea have altered Ms M's >electrolyte balance? > >Question 2 - If an electrolyte imbalance has occurred >how might this affect muscle function? > >Hint: - think nerve impulses & what is needed for >normal action potentials. [ Post a Reply to This Message ]