Homeostasis Flashcards
What is the definition of homeostasis?
Where your body maintains a constant internal environment
What must the body keep control of ?
Water levels
Blood glucose concentration
Body temperature
What do all control systems contain?
receptors
co ordination centre
effectors
What does the receptor do, and how an example.
Detect stimuli (changes in environment)
-skin
What does the co ordination centre do, and give an example.
The brain or the spinal cord or pancreas
-receive and process information from the receptors
What does the effectors do, and give an example.
Muscle or gland
- bring about a response and restore optimum levels
What is the order of the nervous systems response?
Stimuli-receptor-CNS-effector-response
What is a sensory neurone?
The neurones that carry information as electrical impulses from the receptors to the CNS
What is a motor neurone?
The neurones thus carry electrical impulses from the CNS to effectors
What are effectors?
All your muscles and glands, which respond to nervous impulses
What do receptors do?
Detect stimuli
What do effectors do?
Bring about change
What is the connection between two neurones called ? And how does it work?
When the electoral impulses reach the end of a neurone it stimulates the release of a chemical. chemicals diffuse across the synapse to activate the chemical in the next neurone
What are the differences between the nervous system and reflexes ?
*reflexes bypass the conscious part of the brain
*responses use either the brain or spinal cord
*reflexes are fast and prevent injury
Why are reflexes quicker ?
You don’t have to think about the response
