By What is Poikilotherms in biology?
: an organism (such as a frog) with a variable body temperature that tends to fluctuate with and is similar to or slightly higher than the temperature of its environment : a cold-blooded organism.
Why are fish poikilotherms?
Plus, fishes’ blood has almost direct contact with their heat-robbing environment—through the gills. So for fishes, this means that using your metabolism to keep warm would be very energetically expensive. In that sense, poikilothermy represents an evolutionary advantage, rather than a disadvantage.
How are Myotomes tested?
L3 Test extension at the knee by placing one hand under the knee and the other on top of the lower leg to provide resistance. Ask the patient to “kick out” or extend the lower leg at the knee. Repeat and compare to the other leg. This tests the quadriceps muscle.
Which is the best definition of a poikilotherm?
Definition of poikilotherm. : an organism (such as a frog) with a variable body temperature that tends to fluctuate with and is similar to or slightly higher than the temperature of its environment : a cold-blooded organism.
How are poikilotherms different from cold blooded ectotherms?
Many terrestrial ectotherms are poikilothermic. However some ectotherms remain in temperature-constant environments to the point that they are actually able to maintain a constant internal temperature (i.e. are homeothermic ). It is this distinction that often makes the term “poikilotherm” more useful than the vernacular “cold-blooded”,…
How are poikilotherms different from reptiles and amphibians?
‘This is distinct from poikilotherms, such as reptiles and amphibians, whose body temperature is just above the ambient temperature, and varies with it.’ ‘On the positive side, there is substantial evidence that poikilotherms have lower metabolic rates and longer life spans at cooler temperatures (reviewed by FINCH 1990; ARKING 1998).’
What makes a cold water fish a poikilotherm?
The lower proline and hydroxproline contents of cold-water fish and other poikilotherm animals leads to their collagen having a lower thermal stability than mammalian collagen. Retrieved from Wikipedia CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/.