食品號四
日三初月三十年午丙腐复
WAH KIU YAT PO
育教僑華
某文中學會考試題預習
生物科
3.S.SANDHU
REGULATION "OF BODY TEMPERATURE:
(十一),山度士
In animals heat is produced during various Metabolic
activities, chemical changes in various organs and
muscles and nervous conditions. Heat is also absorbed.
From the environment as well as lost to the environment
depending on the difference in degree of hotness or
coldness.
{
Therefore in animals with constant body temperature)
(HOMOIOTHERMIC) there are devices for the regulation)
of temperature
(a) The blood distributes the heat evenly by flowing?
through the over-heated parts to the gooler parte
The sweat-pores contract or dilate to allow less
levest or more sweat to escape thereby conserving
the body heat or losing the body heat by cooling)
(effect caused by evaporation of sweat.
In case of too much heat the blood flow is directed.
more to the surface area of the body by the dilation
of the blood vessels running under the skin. In oras
of less heat (very cold days) the blood vessels
}
三期
mrface constrict thereby allowing very
ittle blood to flow near the surface thus preven,
Ling loss of heat due to radiation This results
paleness of face on cold days.
d). The hair or fur prevent the loss of heat by creatin an insulating layer by trapping air in them by bein
raised a little by the Arrectan F11/
e) The spasmodic contractions of the muscles (shivering) Tent involuntary muscular action, create some heat by
erature in case of) doing work to raise the body.
'great Loss of heati
(f) Artificially man can depend on heaters in winter
and air-conditioners in summer Naru ciocnes and alcohol also help in keeping warm,
In animals which have no devices for controlling the 1 temperature of the body, the body temperature varies according to the hotness or colabess of the environment,
Their body temperature is only a few degrees (°F)
higher than the environment. Such animals are know
"Cold-blooded animals" (PORK BLOTHERMIC) 8.8. rept Lles
fish, frog. These animals cannet-eurvive Inext réngg y!
clius te heir body temperatures will rise or fall
ccordingly. This is the reason why Teas and repo
ter eleap" or HIBERNATION. During this
hime there is complete Inactivity and the animal cannot
awakened even by touching their body feels cold to
4二十月一带七六九一鹰公年六十五國民華中
馬競備證
The Invertebrates, as insects, also come under the Cold Alooded category. In severe winter, their sctiVILY. DOLJE
ta such an extent that they become (immobilised 1.a. tha
chemical activities in their bodies become slowed
less energy produced hence causing the creatures
leath or torport
LEVANTAGES OF WARM-BLOODED! OVER COLD-BLOODED ANIMALS,
far-blooded (Homolothermic, animale have a conetand
也
===
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Body temperature," regulated by an efficient thermgatatic
Arrangement 1.e. various devices for controlling thej
temperature. It is not changed by the temperature_of_the
enyi forment which may be the Tropical:beat or the Articl Cold. Therefore they can carry on the metabolic activities free from the outside range of temperatures which the
Cold-blooded animals cannot do ☐ (Poikilothermic), dua
to lack of thermostatic control. Thus mammals can readily
adant themselves to most of the regions of the world eng
man has habitated places with extremes of diimte. This! the Cold-blooded creatures are unable to do lei.se their limitations in propagation and habitation of some parte
at the WoFLO-
sudden fluctuations in temperatures to the extremes een
endanger the lives of cold-blooded animals whereas the
warm-blooded animals and their metabolic activities
remains unaffected hence core chances of SURVIVAL
xplain Reflex Action.
What do you understand by #Conditioned Reflexh
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