KA4- Homeostasis Flashcards
What is homeostasis?
The maintenance of a constant internal environment within tolerable limits
How is homeostasis brought about?
By a negative feedback control
What does homeostasis require?
Energy
What is negative feedback?
Where any change in a condition form the optimum is detected by receptors
What happens once these receptors have detected a change from the optimum?
A corrective mechanism is activated by sending messages to effectors to restore the conditions to normal
How is a corrective mechanism activated?
By sending messages to effectors
What happens to the corrective mechanism once the conditions return to normal?
It is then switched off
What is thermoregulation?
Control of the body’s temperature
How is thermoregulation brought about by?
Homeostatic control
What does thermoregulation involve?
Negative feedback
How do ectotherms regulate body temp?
Behavioural thermoregulation
How do ectotherms obtain most of their body heat?
By absorbing it from their surroundings
What are endotherms?
Animals that are able to maintain their body temp at a relatively constant level, independent of the temp of the external environment
What generates heat energy in endotherms?
High metabolic rate
What type of metabolism do endotherms have?
An efficient one
