The higher the concentration of alcohol, the lower Daphnia heart rate got. Report similar behavior in animals at similar distances and times relative to. This experiment can be used to show the practical application of chemicals and temperatures in regulating body function. If too much alcohol is added, it will result in the death of the animal. Then the same procedure using the Petri dish to changed environmental conditions was used with cold tap water 23 degrees , warm tap water 30 degrees , and hot tap water 45 degrees.
The teams each obtained a depression slide and smeared a small amount of petroleum jelly on one of the wells. Flatworms have a cephalized nervous system that consists of head ganglion brain , usually attached to longitudinal nerve cords that are interconnected across the body by transverse branches. At some point the high concentration of caffeine will cause the heart to stop functioning. A Simple was used to draw off excess fluid from the slide. After the epinephrine was diluted from the slide the average heart rate returned to an average of 78 beats in 15 seconds, with a decrease of 7% from the heart rate with epinephrine. Warming the water to about 15 °C also ensures rapid growth of the colony. The average heart rate then decreased by 33% in cold water.
What was the independent manipulated variable in your experiment? The alcohol acts by inhibiting the nervous system. When the predator and the prey meet they will interact with each other. Results provide further evidence of Daphnia as a unique model system in. Then each team used their pipette to draw a Daphnia magna from the jar and placed it on the petroleum jelly covered well. They feed by filtering minute particles such as bacteria and algae, from the fresh water in which they live.
A drug that slows heart rate is called a negative chronotrope; this is demonstrated in this experiment, where acetylcholine is used to slow the rate of the Daphnia's heart. For chronic effect of Potassium dichromate to Daphnia magna. Explain using evidence from the experimental results. Risk assessment Risks Prevention Caffeine Concentrations in eyes or spillages onto clothes Caffeine concentrations could splash into the eyes causing irritation, this could be prevented by wearing goggles. Introduction: Blue Baby Syndrome is a condition that affects many infants.
By reducing the ability of platelets to adhere to damaged blood vessel walls, aspirin reduces the chance of coronary artery thrombosis, the event that precipitates a heart attack. Western Lake Erie has been. It is recommended that you use one timer but it will also work if you use one timer for each Daphnia. This was not what we expected based on knowledge of how stimulants affect animals. Safety Precautions To acquire steady results, implementation of effective breathing control in every set coupled with sound pulsation monitor that will record any observation with heightened keenness and accuracy. LaFave, 2003 These effects will work together to increase an animals heart rate.
However, in recent years, it has become increasingly clear that this mendelian inheritance pattern is not sufficient to explain all the variation that can be seen in genetically identical organisms, for example, human twins, though they share an identical genotype, can still show different phenotypes towards diseases Wong et al. Thomas et al 2001 found that Daphnia heart rate increases significantly in. When a ten percent solution was added the heart stopped. There also could have been errors in the way Daphnia was handled. The first experiment uses strictly D.
Essay 1992 dream team essay regulated capitalism vs socialism essays essay writing in english computer daphnia lab report essays a essay. Neither you, nor the coeditors you shared it with will be able to recover it again. Ethical issues Teachers should be careful to introduce these animals in a way that promotes a good ethical attitude towards them and not a simply instrumental one. What are some of the effects of Ethanol? Based on this data it can be reasoned that Daphnia heart rate will lower anytime it is introduced to a colder environment. Repeat steps 2-8 for each additive. It is a white crystalline xanthine alkaloid.
Hypothesis 3: The hypothesis is that the heart rate of Daphnia magna will increase as higher concentrations of caffeine solution are introduced to the system. This step leaves you with a 5% ethanol concentration. However this would also be dependent of the room temperature as daphnias are cold blooded animals, they do not thermo regulate which means that their body temperature is the same as the water they are floating in. Noradrenaline and adrenaline: In contrast, heart rate is increased by the sympathetic nervous system neurotransmitter: noradrenaline and the hormone adrenaline circulating in the blood via activation of cell surface receptors in the sinoatrial node - pacemaker called beta-1 adrenoceptors. It lives in small bodies of freshwater. Engineered Nanoparticles pose an even greater anent and forthcoming threat to the health and safety of those exposed to them, as their nanoscale size allows them to enter the lungs and even the bloodstream with considerable ease.
The Daphnia in the temperature experiments had a considerably higher heart rate than that of the Daphnia used in the solution experiments. The effect of temperature on a metabolic activity may be expressed in terms of the temperature coefficient Q 10. Western Lake Erie has been. Heart rate readings were taken after each solution. The lab report should be written in paragraph form with headings that are written in the same style and font for each section.