A2 BIOLOGY F214 4.1.1HOMEOSTASIS ANOTHER HARDEST QUIZ EVER

A2 BIOLOGY OCR F214  4.1.1HOMEOSTASIS ANOTHER HARDEST QUIZ EVER

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  • Created by: Ruby
  • Created on: 06-12-12 22:28
why is there a need for a communication system in multicelluar organisms?
in order to coordinate different cell activities/respond to internal envornment and external environment
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the role of peripheral receptors include
give "early warnings" that the body temp may change, hypothalamus responds to aviod variation of body core temp
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role of a hypothalamus includes
monitoring core body temp to detect any changes in the body core temp
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state the two thermoregulatory centres of the hypothalamus
heat gain and heat loss centres
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why do we need to maintain body core temperatures in endotherms?
could have a dramatic effect on protein structure e.g enzymes as high temp means enzymes are denatured and cannot rebuild again
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what are the anatomical/physiological mechanisms used by endotherms to maintain body core when its low
shivering/rising of hair on ends/vasoconstriction/less sweating
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what are the anatomical/physiological mechanisms used by endotherms to maintain body core when its high
no spontaneous shivering/lowering of body hairs/vasodilation /more sweating
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what are the behavioral echanisms used by endotherms to maintain body core when its high
remain inactive by spreading out the limbs to increase surface areas of the skin exposed/aviod heat of the day by sheltering i a burrow, seeking out shade/
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what are the behavioral echanisms used by endotherms to maintain body core when its low
move towards sunlight/warmer envirnment/increase respiration rate to generate more heat in the muscles/keep skill and roll into a ball top reduce surface area exposed
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what are the behavioral echanisms used by ectotherms to increase body core when its low
expose body towards the sun so that maximum surface area of the body is absorbed towards sun/gain warmth from hot ground/orientate body towards sun
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what are the physiological/anatomical adaptions used by ectotherms to increase body core when its low
altering their body shape/increase abdominal breathing movement
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what are the disadvantages of being an ectotherm
less active in cooler temp puts them at greater risk of predation/uncapable of activity in the winter, less chance of survival/unable to increase respiration rate to generate more heat internally so rely on external heat source to keep war/
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what are the advantages of being an ectotherm
greater proportion of their energy is obtained fromm food could be used for growth e.g rgenration of limbs for ectotherms/need less food for survival so could wait for long time without eating/less food used for respiration
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what are the advantages of being an endotherm
fairly constant body temp/ability to inhibit in cold parts of the planet, so there is no problem migrating for food elsewhere/they are acvtive when external temp is not cool in different seasons
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what are the disadvantages of being an endotherm
signifiant part od the energy intake is used to maintain body core temp so more food is needed for growth/more food is required to stay warm
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Other cards in this set

Card 2

Front

the role of peripheral receptors include

Back

give "early warnings" that the body temp may change, hypothalamus responds to aviod variation of body core temp

Card 3

Front

role of a hypothalamus includes

Back

Preview of the front of card 3

Card 4

Front

state the two thermoregulatory centres of the hypothalamus

Back

Preview of the front of card 4

Card 5

Front

why do we need to maintain body core temperatures in endotherms?

Back

Preview of the front of card 5
View more cards

Comments

HUNTER BRO

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Mate your spelling is atrocious. what on earth is a asodilation LMAOOOOO is it when your *** dilates.     WHAT IS A ... echanisum bro ? and fromm bro i got a exam tomorrow can you fix up your stuff and your quiz it has left me in quite a state it has left questioning my whole life oh and education :) PEACE OUTTTT oh and your welcome ;)

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