Pages in this set

Page 1

Preview of page 1
anaH

Daphnia Heart Rate

:Aim

To investigate the effect of caffeineon the heart rate of Daphnia

:Background

Plants produce caffeine as an insecticide. Caffeine has medicinal uses in aspirin
preparations and weight-loss drugs. In humans, caffeine has been linked to
restlessness, insomnia and anxiety, causing raised stress and blood pressure.…

Page 2

Preview of page 2
anaH

:Method
Place a few strands of cotton wool on a cavity (this restricts the movement of the .1
.(water flea

.Transfer one water flea to a cavity slide with a pipette .2

.Remove any water with filter paper and add distilled water or pond water .3

.(Place a cavity…

Page 3

Preview of page 3
anaH


:Results

.Experiment 1 ­ Daphnia were put on ice 30 minutes before the experiment


Treatmen Mean for individual/ beats
t Heart rate / beats 30 s-1 min -1
Trial 1 Trial 2 Trial 3 Mean
Caffeine
Caffeine
Caffeine
Caffeine
Caffeine
Control
Control
Control
Control
Control

.Experiment 2 ­ the…

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »