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Science 47 Online
MusicGeek:

Hypothesis: Snake metabolism increases when the temperature increases, and decreases when the temperature decreases. (Snake metabolism goes up when the temperature goes up, and goes down when the temperature goes down). Experiment: Biologists took 100 snakes and kept them at 50°F for 2 weeks. During this time they measured their metabolic rate (metabolism). They then took the same 100 snakes and kept them at 80°F for 2 weeks. During this time they measured their metabolic rate (metabolism). Independent variable - Dependent variable - Control group -Experimental group

vDeku666:

Some snakes have a feeding regime characterized by the infrequent ingestion of relatively large meals, causing impressive increments in post-prandial metabolism. Metabolism remains elevated for many days, while digestion proceeds, resulting in considerable investment of time and energy. Snakes actively adjust thermoregulatory behavior to raise their body temperature during digestion, exhibiting a post-prandial thermophilic response that accelerates digestion at the expense of higher metabolic rates. In the present study, we investigated the possibility that endogenously derived heat, originating as a byproduct of the post-prandial increase in metabolism, could itself contribute to the elevated body temperature during digestion in the South American rattlesnake Crotalus durissus. We assessed heat production, at a constant environmental temperature, by taking infrared (IR) images of snakes during fasting and after being fed meals varying from 10% to 50% of their own body masses. Our results show clearly that digesting rattlesnakes have significantly increased body temperatures, even when precluded from adjusting their thermoregulatory behavior. The feeding-derived thermogenesis caused the surface body temperature of rattlesnakes to increase by 0.9-1.2 degrees C, a temperature change that will significantly affect digestive performance. The alterations in body temperature following feeding correlated closely with the temporal profile of changes in post-prandial metabolism. Moreover, the magnitude of the thermogenesis was greater for snakes fed large meals, as was the corresponding metabolic response. Since IR imaging only assesses surface temperatures, the magnitude of the thermogenesis and the changes in deep core temperature could be even more pronounced than is reported here.

AxL1nna:

oh sheesh, u typed all that in a few minutes?

MusicGeek:

Okay but what are the independent and dependent variables? And the experimental and control groups?

vDeku666:

wut were the options?

MusicGeek:

there was none.

vDeku666:

oop-

vDeku666:

Sorry then

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