Homeostasis (5.1) Flashcards
What is homeostasis?
The regulation of the internal conditions of a cell or organism to maintain optimum conditions for function in response to internal and external changes
What are stimuli?
changes in the environment
Why do internal conditions need to be carefully controlled by homeostasis?
to maintain optimal conditions for enzyme action and all cell functions.
3 needed
Which conditions are controlled by homeostasis in the human body?
- blood glucose concentration
- body temperature
- water levels
What type of control systems are those regulated by homeostasis?
automatic control systems
2 needed
These automatic control systems may involve what type of responses?
nervous responses or chemical responses.
3 basic components
What do all control systems include?
- receptors
- coordinators
- effectors
What are receptors?
cells which detect stimuli
What is an example of receptor?
skin
What is the role of coordination centres?
they receive and process information from receptors
3 needed
What are examples of coordination centres?
brain, spinal cord (both CNS) and pancreas
What is the role of the effectors?
to bring about responses which restore optimum levels.
What tissues are effectors in the human body?
muscles (contract) and glands (secret hormones)
