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RESPECT FOR WOMEN IS PARAMOUNTNetworking
Animals are divided into:-
Advantages of endothermy:-
Disadvantages of endothermy
Advantages of ectothermy
Disadvantages of ecotothermy
Their metabolic rate is normally kept low which affects response to stimuli when external temperature is low
How heat is lose and gained by organisms.
Heat gained.
Heat lost
Regulation of temperature in ecototherms
They majorly use behavioural methods e.g.
Re-orientation of body with respect to solar radiation can vary surface area exposed to heating eg prostate posture of iguna alignes body at right angle to sun’s rays, helps raise its temperature in cold. Elevated posture reduced exposed surface and mouth and lower body temperature in hot.
Diapouse occurs in insects. Diapause is a form of dormancy that occurs at any stage in the live cycle of an insect (ie egg, larva, pupa, adult, rymph). It is related to photoperiod and is a seasonal adaptation that through changes in brain secretion enables the species to survive hazardous environmental conditions and produce offspring in favourable conditions.
Physiological means
Very few show a slight degree of thermoregulation through activity of pigment cells which occur in their skins. In some reptiles a high temperature (40 0C) leads to bleaching of the colour to decrease heat absorption. A low temperature (50C) causes darkening and hence increased heat absorption
The colour changes are brought about by chromotophores in the stein.
Regulation of temperature in endotherms
Physiological, anatomical and behavioural adaptations/means are used.
Response to cold by an endotherm:-
Physical means
Use of counter current heat exchange systems.
Extremities of animals in cold regions are maintained at lower temperature, than the core body temperature; reducing the temperature gradient between them and the environment. Reduction of heat loss from these extremities is achieved by counter current heat exchanges which occur e.g. in limbs of certain binds and mammals like flippers of the whale, limbs of ducts, human foot and hands that are in contact with the cold environment.
Sweat glands become less active.
temperature induce in increased activity of adrenal, thyroid and
pituitary glands which produce hormones that help increase
metabolism and production of heat.
undergo rhythmic involuntary contractions to generate heat.
“goose flesh” that resemble pimples.
Anatomical means.
Insulatory means:-
Insulation is also achieved by an external covering of fun and feather which are denser and thicker for cold region dwellers than those in hot regions. Both function by trapping warm air net to the body
SIZE
Animals in cold regions are larger than their counter parts in warm regions, hence smaller surface area to volume. Animals is cold regions have smaller extremities than thee one in warm regions. To reduce surface area for heat loss.
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THIS VIDEO TEACHES ABOUT ENDOTHERMS AND ECTOTHERMS
ASSIGNMENT : TEMPERATURE REGULATION Assignment MARKS : 20 DURATION : 24 hours