Temperature Regulation Flashcards
Importance of homeostasis?
To regulate temperature and pH for enzyme productivity and water and salt for cells (hypotonic, hypertonic) and in plants (turgid or plasmolysed)
What is homeostasis?
The maintenance of a constant internal environment
What are the advantages of homeostasis?
1) there are always optimal conditions regardless of the external environment.
2) this allows living organisms to be independent as they wouldn’t be prone to the external conditions of the environment
According to temperature regulation, animals can be based according to?
1) homeothermic
2) poikilothermic
How do poikilothermic animals regulate temperature?
By means of behaviour
( lizard basking in sun when body is cold then returns to shade when too hot)
(Insects hide in the ground when sun is too hot and is active at night)
According to temperature regulation, plants are?
Poikilothermic
How do plants regulate temperature?
When it is too hot, they regulate their surface area above ground.
When too cold, they lower their metabolic rate.
How does the body control the body temperature when temperature rises above 37*C?
1) Sweating: Heat is trapped in water and water then evaporates
2) Vasodilation: capillaries in dermis dilate and heat is lost from blood
3) Hair/pili erector muscles relax: hairs lie flat so no insulating layer of air is created
What happens when body temperature decreases?
1) Sweating stops/ slows down: no- less sweat this less-no heat removed by evaporation.
2) Vasoconstriction: capillaries of dermis constrict so little heat is lost from blood thus heat is retained deeper in the body
3) Hair/pili muscles contract: hairs stand up thus creating a layer of insulated air
