Homeostatis Flashcards
Definition for homeostasis
The regulation of the conditions inside your body to maintain a stable environment
In responses to changes both internally and externally
Why is homeostasis important
Because your cells need the right conditions in order to function properly and for enzyme action
What are the control systems that regulate internal environment
Nervous system
Hormonal system
What conditions need regulating in your internal environment
Body temperature
Blood glucose content
Water content
What are the control systems made up of to maintain a steady condition
Receptors Coordination centre Effectors Stimulus Control centre
What does the nervous system control
Temperature
Co2 levels
What does the endocrine (hormone) system control
Blood sugar level
Adrenaline
What is controlled by the nervous and endocrine system
Water
What is a stimulus
Change in environment
Where are coordination centres in the body
Brain
Pancreas
Spinal cord
What system does the body use to bring the body’s levels back to normal
Negative feedback
What’s the first 2 things that happen in negative feedback
The receptors in the body detect a stimulus (change in environment)
Then the receptor sends information to the coordination centre and that processes the info and organises a response
What the 3rd and 4th thing that happens in negative feedback
The effectors then produce a response which counteracts the change and restores the optimum level
The effectors will carry on producing the responses for as long as stimulated by the coordination centre
What is the nervous system made up of
The central nervous system
Sensory neurons
Motor neuronses
Effectors
What are sensory Nuerons
Neurons that carry information as electrical impulses from receptors to cns
What are motor neurons
Nuerons that carry electrical impulses from cns to effectors
What are effectors
All muscles and glands which respond to nervous impulses
What are the 3 main types of receptors
Taste on tongue
Sound in ears
Smell in nose
What’s a complex receptor
Retina on the eye is made up of many light receptors
How do the muscles and glands act differently when responding to nervous impulse
The muscles contract
The glands secrete hormones
Give the order of how the nervous system works
Stimulus Receptor Sensory Nuerone CNS Motor nuerone Effector Response
What do synapses do
Connect neurones or the connection between two neurones
Define what a reflex is
A rapid automatic response to certain stimuli that don’t involve the conscious part of the brain
Give an example of a reflex
Pupils automatically get smaller when a bright light is shined on you
