Physiological Homeostasis Flashcards
what is the most prominent type of feedback loop in homeostasis
Negative
what is a feedback loop
A process where an output or result of a system is fed back into the system - influencing subsequent actions
What does a positive feedback loop do
Facilitate rapid responses to specific situations eg. blood clotting or childbirth - usually has mechanisms to terminate process once desired outcome is achieved. -Reinforce or amplify
What does a negative feedback loop do
Works to maintain a stable internal environment by counteracting deviations from desired set point - Stabilizes or balances
what does homeostasis do
maintains living things internal stability whilst adjusting to changing external conditions
Response to rise in temp
Sweat to cool down
What does homeostasis respond to
Behavioural or physiological triggers
What factors are under the control of homeostasis
Nutrients
Gases (O2 and CO2 within blood)
Waste products (Urea and lactic acid)
pH
Salt and other electrolytes
Temperature
Volume and pressure (blood)
where are sensor chemoreceptors found
Medulla oblongata
what do sensor chemoreceptors do
detect change in CO2 levels in body
What do sensors do - homeostasis
relay afferent information to the brain
What is a comparator - homeostasis
processes changes and compares to set point
what do effectors do - homeostasis
allow change of physiological variables
Positive feedback loops tend to push system…
…further away from equilibrium
When does feedforward occur
In anticipation of change
As a pre-emptive adjustment
In efficient response
