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Summary 5.1 Communication and Homeostasis
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OCR Biology A (A-level) 5.1 Communication and homeostasis including: homeostasis (examples of positive and negative feedback), thermoregulation ectotherms/endotherms and adaptations, cell signalling (neuronal and hormonal signalling). Excretion as homeostatic control: kidney failure via haemodialys...

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  • No
  • 5.1
  • August 22, 2023
  • 2
  • 2021/2022
  • Summary

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Eg. dilation of the cervix during childbirth
Positive fee
The result of many positive increases o
feedback loops is death :)

Temperature

Water potential A constant internal environment consisting of
factors is maintained despite changed in Homeo
pH external environment

Blood glucose level
Examp


Cannot increase respiration
Organism which
rate to increase internal
regulates body temp
production of heat-
with help from external
dependent on external energy
source
sources Ectotherms

Control heat by exchanging heat with surroundings (eg. basking in sun
or increasing breathing rate for heat loss via evaporation of water)

Both have physiological or Thermoregu
To restore optimum temp. (NEGATIVE FEEDBACK)
behavioral responses

Contain thermoreceptors to monitor
Able to maintain constant
core body temp changes +
body temp. not dependent Endotherms
communicate them to hypothalamus
on external temp. Responses
creating an appropriate response

Basking in/moving away from sun

Moving to hot/cool surface

Both endotherms Panting
AND exotherms
respond like this Vasoconstriction/dilation

Hibernation

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