MadSci Network: Zoology
Query:

Subject: why does heart rate of daphnia change in the presence of an antioxidants+ c

Date: Mon Jan 24 13:38:50 2000
Posted by Xenia
Grade level: 10-12 School: No school entered.
City: No city entered. State/Province: No state entered. Country: No country entered.
Area of science: Zoology
ID: 948742730.Zo
Message:

I am researching for information that may help me to explain the effects 
on the heart rate of daphnia due to the following substances: caffeine, 
vitamin C and vitamin B(thiamin?).  I was hoping you may help as i have 
searched hours in libraries and on the net! In brief.. i know that when 
coffee is drunk it acts as a vasoconstrictor thereby temporarily 
increasing human heart rate...is this true for daphnia ( could u please 
help to explain why ?)  Finally why do vitamins affect heart rate + why 
would they have a different affect on h.rate when used in conjunction with 
the coffee solution.
Thank you for your time :)   ^_^ 


Re: why does heart rate of daphnia change in the presence of an antioxidants+ c

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