This experiment studies the effects of common household drugs on circulatory functions, focusing primarily on how it affects pulsation rates in Lumbriculus variegatus. Lumbriculus variegatus is an ideal organism for studying the effect of drugs on the circulatory system due to their transparent bodies and their simple physiology. Their transparent bodies make it easy to observe the pulse rate and the drugs quickly diffuse through the bodies, providing immediate effects.
The circulatory system is a network of organs that are in charge of pumping blood, nutrients, and hormones to the different areas of the body.
Many things can affect the physiology of our bodies, such as common household drugs like caffeine and nicotine. To see the effects of these drugs, the pulsation rate in Lumbriculus variegatus will be observed.
This lab is divided into two parts; the first part consists of using known concentrations of caffeine and nicotine and observing their effects on the Lumbriculus variegatus’ pulsation rate. The second part consists of using common household drugs such as tea, chewing tobacco, decaff, coffee, and a cigarette.
The different concentrations of caffeine will affect the pulsation rate of Lumbriculus variegatus by increasing it. Caffeine is a stimulant that affects the central nervous system. A stimulant usually causes increased heart rate and blood flow, therefore, if caffeine is given to the worms it will increase in relation to the amount of caffeine (Lab manual).
Differing concentrations of nicotine will influence the pulsation rate of blackworms. Nicotine is a special type of drug, it acts as a stimulant in high doses while as a depressant in low doses.
Nicotine affects our central nervous system and heart just like caffeine (Lab manual).
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