# Essay on Effect of Temp on Endo and Ectotherms (Metabolism)

1105 Words Oct 1st, 1999 5 Pages
Animal metabolism consists of the utilization of nutrients absorbed from the digestive tract and their catabolism as fuel for energy or their conversion into substances of the body. Metabolism is a continuous process because the molecules and even most cells of the body have brief lifetimes and are constantly replaced, while tissue as a whole maintains its characteristic structure. This constant rebuilding process without a net change in the amount of a cell constituent is known as dynamic equilibrium (Grolier1996). In the combustion of food, oxygen is used and carbon dioxide is given off. The rate of oxygen consumption indicates the energy expenditure of an organism, or its metabolic rate (Grolier1996). Metabolic rate is directly …show more content…
Each group shared their findings with the class. The metabolic rates of the mouse were conducted by the instructor and distributed. We also did not use the Winkler method to measure the O2 levels. We used a measuring device instead. The results of this experiment are shown in the compiled student data in Table 1 below. the metabolic rates of the mouse remained constant with a slight flux, however, the crayfish metabolic rates were very different from one another. Table 1 Metabolic Rates of Mouse and Crayfish at Various Temperatures Temperature C Metabolic Rate of Mouse (ml O2/min/gm) Metabolic Rate of Crayfish (ml O2/min/gm) 5 0.18 1.04 10 0.19 0.38 15 0.14 0.05 20 0.11 0.26

In Figure 1, the graph shows how the metabolic rates changed as a result of temperature.

Figure 1 Metabolic Rates as a Result of Temperature for Mouse and Crayfish The regression equations that were calculated for both the mouse and the crayfish were determined through the formula Y = bXi + a. The results were Y = -5.2E-3 X + 0.22 for the mouse, and Y = -0.05 X + 1.1 for the crayfish. To view the procedures for these calculations, view p9-6 in Duncan and Townsend, 1996. Both of these equations have a negative slope, though the slope for the crayfish is substantially larger. The metabolic rates for the crayfish were also