Effect of Caffeine on Daphnia Heart rate 24/09/2012 Core Biology Practical (1) Introduction: Caffeine is the drug taken most globally, and can cause health problems such as raised blood pressure. Since we are looking at the heart, we decided to test the effects exposing daphnia to caffeine would have on the daphnia’s heart. Daphnia’s are small water-fleas with transparent body therefore the heart can be visibly seen even without a microscope making the experiment easy to be carried out. Aim: In this investigation, I aim to determine the effect of caffeine on daphnia heart rate Hypothesis: An exposure to higher concentrations of caffeine will cause a distinct increase in the heart rate of daphnia. Null Hypothesis: An exposure to higher concentrations of caffeine will have no effect on the heart rate of daphnia.
The effectiveness of lipase on temperature Abstract Enzymes are biological catalyst that speeds up the rate of reaction. Different enzymes work best at different temperatures, which is also called an optimum temperature. Different enzymes also have different functions. Lipases are enzymes, needed to break down lipids (fats and oils) into the products - glycerol and fatty acids. They work best at room temperature around 36-40 C. Introduction For this experiment, I will be looking at how the change in temperature affects the rate of reaction.
The effect of caffeine on the heart rate of Daphnia AIM: In this experiment I am going to investigate the effect of different concentrations of caffeine on the heart rate of Daphnia. My hypothesis is that the higher the concentration of caffeine, the higher the heart rate. Also, I think that there would be a concentration of caffeine where the daphnia would not be able to live. INTRODUCTION: Daphnia are tiny crustaceans which are about 0.2 to 5 mm that live mainly in fresh water; lakes, rivers and ponds. They are perfect to be used in experiments to needs observation of organs as Daphnia are transparent animals.
Overproduction of CSF Intracranial pressure rises if production of CSF is more than absorption. One possible cause is that CSF may be overproduced. In this case resistance to CSF flow, or venous sinus pressure may be increased as a result. CSF production will decrease as ICP rises. The brain compensates by absorption of CSF across ventricles.
The concentration of carbon dioxide will be tested after a specified time of exercise. Also how the exhalation of carbon dioxide changes with the amount of exercise will be observed. This experiment should show the relationship between these two variables. Hypothesis: The amount of time the Bromothymol Blue takes to turn green will decrease as the amount of time to exercise increases. This will be so because exercising will cause more oxygen intake and will lead to breathing out more carbon dioxide.
The Effect of Caffeine on the Heart Rate of Daphnia Introduction In humans, caffeine acts as a stimulant drug, causing an increased heart rate. At high levels of consumption, caffeine has been linked to restlessness, increased stress and blood pressure. We decided to experiment on the effects of caffeine on daphnia and to see whether the same effects apply to their heart rate as they do to humans. Hypothesis As you increase the concentration of caffeine, the daphnia’s heart rate will also increase Ethical issues with using invertebrates We chose to use daphnia in our experiment, mainly for the practicality that they are transparent, so we were able to visibly see their heart clearly, making the experiment easy to be carried out. We also used them because they don’t have very complex nervous systems like other larger animals, meaning they don’t feel as much pain as some animals, such as dogs.
This sends a signal to the heart that Ben’s blood pressure is low, and the heart begins to pump at an increased rate to correct the problem. b. After reading page 12 of your textbook, please explain the difference between autoregulation and extrinsic regulation. Autoregulation is a response in the body that occurs automatically when there is an environmental change, such as blood vessels dilating when there is a lack of oxygen in the area, whereas extrinsic regulation is a response that is controlled by the nervous or endocrine systems. c. Is your example in part 1a an example of autoregulation or extrinsic regulation?
Homeostasis is known as the maintenance of a constant internal environment despite external changes or stimuli in references to exercise. When the muscles in your body contract, the glucose will be used up so in order for the blood glucose levels to be maintained stimuli changes the blood glucose concentrations. Negative feedback increases blood glucose levels by secreting glucagon, the alpha cells in pancreas this stimulates the liver to convert glycogen into glucose, which is then released and absorbed by the cells in the body. Homeostasis is changing to the environment. During exercise our body undergoes a lot of changes.
Investigation to Determine the Effect of Caffeine on Blood Pressure Aim The Aim of this experiment was to determine the effect of caffeinated drinks of varying caffeine levels on the blood pressure of three different participants. Hypothesis It was thought that caffeine intake would have increased the blood pressure of each individual. It was thought that the heart rate of participant one would raise less than participant two and that participant three would have the highest difference. This was thought to be due to the average daily intake of caffeine that each participant determined from a pre-experimental questionnaire. Ti was also thought that the caffeine free Coca-Cola would show no change in blood pressure due to the Method Three adults of similar build and weight were chosen to participate in the investigation.
It can be created by adding sulfuric acid and hydrogen peroxide on a variety of Copper (II) compounds. Copper (II) Sulfate has more uses in today’s society than one would think. Adding lime to copper (II) sulfate penta-hydrate it is known as Bordeaux, and kills off germs on berries such as grapes and watermelons. Pool owners add it to their chemical concoction in the summer as an algaecide. Copper (II) sulfate is toxic to fish, and must be used wisely when eradicating pesky snails and fish parasites.