Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
The effect of caffeine concentration on the heart rate of Daphnia.
Member rating:
(1 vote)
| Words:
| Submitted: Mon Feb 09 2004
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
The effect of caffeine concentration on the heart rate of Daphnia Aim To conduct an experiment into the relationship between the heart rate of a Daphnia and its exposure to various concentrations of caffeine. Method For this experiment we had: Culture of Daphnia in various concentrations (%) of caffeine (0.0, 0.0025, 0.005, 0.025, 0.05, 0.25, 0.5) Two cavity slides A pipette Stop watch Microscope Ice water Firstly, a job was designated to each member of the group and each had a counter, a recorder and a controller. The controller always set up each slide to ensure that the other members of the group were unaware of the concentration of caffeine that the Daphnia were exposed to, thereby eradicating bias, and also controlled the time. The counter would count the number of heart beats in ten second intervals by stabbing at a piece of paper with a pen, in an 'S' shape. This allowed for easy counting and...
Get instant access
- Instant, unlimited access to our documents in full
- Swap your work for free access, or pay £4.99
- To see the full version of this document and 146,168 others
Receive email updates for this category
- Simply tell us your email address and receive a weekly Study Help Email for FREE
- Receive 3 FREE essay views with each email
- Get all the latest essays from Coursework.Info & discussion from TheStudentRoom.co.uk
