2. Course Title: Form and Function II Course Code: ZOO-201
Presenter: Aqsa Manzoor Roll No: 2180 Discipline: Zoology Semester:
IV
3. Coping mechanism They can find a habitat where they do not
have to contend with temperature extremes. Their physiological
processes may have adapted to the range of temperature in which the
animals are capable of living. Animals can generate and trap heat
internally to maintain a constant body temperature irrespective of
the external environment.
4. Homeothermythe physiological and behavioral maintenance of a
relatively constant internal body temperature (homeotherms
typically show circadian fluctuations in temperature)
Endothermyphysiological and behavioral thermoregulation, but body
temperatures may fluctuate widely.
5. Ectothermyuse only behavioral means to regulate temperature.
Poikilothermythe fluctuation of internal body temperature closely
related to environmental temperature.
7. Categorization endotherms Obtain body heat from cellular
processes. High rates of metabolism. Have bodies insulated by fur
or feathers. More common in Moderate to cool environments. Mostly
Homeotherms. Birds and Mammals. ectotherms Derive most of the body
heat from environment. Low rates of metabolism. Are poorly
Insulated. More common in tropics. Mostly Heterotherms. Reptiles,
Fishes, Amphibians and Invertebrates.
8. Daily torpor
9. References: 1. Stephen, Miller and John, Harley. Zoology.
Fourth edition. McGarrow hills company, 2001. 2. Houseman, John G.
Digital Zoology. 3. Hickman, Robert, Larson. Integrated Principles
of Zoology. Eleventh edition.