b0416

1. Biology Item 04-16 Warm- blooded vertebrates or the homeothermics could withstand changes of temperature better than cold-blooded ones or the poikilothermics because: A. the body temperature of warm-blooded animals fluctuate with their environment B. warm-blooded animals could maintain body temperature that is constant C. poikilothermics have a stable body temperature D. poikilothermics have body temperature that goes up and down with the changes of the temperature of their environment www.upcatreview.com

2. Biology Item 04-16 There is a group of animals that have homeostatic mechanisms for maintaining the temperature of the internal environment within very narrow limits. www.upcatreview.com

3. Biology Item 04-16 They can do this even though there may be large changes in the environmental temperature. Such animals, humans, other mammals and birds, are called homeotherm s. www.upcatreview.com

4. Biology Item 04-16 Regardless of environmental temperature, the metabolism of homeothermics maintains their internal temperature at a constant value. www.upcatreview.com

5. Biology Item 04-16 Humans can therefore function quite efficiently in both cold and hot environments. www.upcatreview.com

6. Biology Item 04-16 Another group of organisms known as poikilotherms have not developed mechanisms for regulating the temperature of their internal environment. www.upcatreview.com

7. Biology Item 04-16 Their internal temperature therefore changes with temperature changes in the external environment. Lizards and snakes are examples of poikilotherms. www.upcatreview.com