4.5 Flashcards
What are feedback mechanisms?
They are cellular responses used to maintain homeostasis by increasing or decreasing a cellular response to the environment
How does negative feedback maintain homeostasis?
Negative feedback mechanisms maintain homeostasis for a particular condition by regulating physiological processes.
How does positive feedback affect homeostasis?
Positive feedback mechanisms amplify responses and processes in biological organisms
What do organisms use feedback systems for?
For the maintaining of their internal environments and to respond to chemical changes
What is homeostasis?
It’s the target set point for a cell to maintain a stable internal environment
What are some examples of things that require homeostasis?
- Body temperature
- Blood pH
What is negative feedback?
It’s a mechanism that maintains homeostasis for a particular cell condition.
If a system is disrupted, the negative feedback system can return the system back to homeostasis
What levels can a negative feedback system operate in?
Molecular and cellular levels
What are positive feedback mechanisms?
They are mechanisms that work to amplify reponses and processes in biological organisms, pushing them further away from homeostasis
What does amplification do?
It pushes the stimulus further into activation, which in turn initiates a cellular response that produces a system change
It pushes it further and further into that system change
What’s an example of positive feedback?
An apple ripening and releasing ethylene gas, which causes another apple to detect it, ripen, and also releast ethylene gas
