Homeoststasis Pg 65-66 Flashcards
What is homeostasis
Homeostasis is the regulation of the conditions inside your body and cells to maintain a stable enviroment in response to the external enviroment.
Changes to the internal enviroment depending on the external enviroment
What are automatic control systems
They maintain things like temperature and glucose levels by regulating internal enviroments through the use of negative feedback
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What is Negative feedback
When for example the body temperature is too high or too low. The receptor detects a stimulus level is too high or low. The coordination centre receives and processes the information and organises a response. Effectors produce a response which counteracts the change and restores the optimum level- the level decreases or incresases. The effectors will carry on until the coordination centre oranise another response. All automatic so you dont have to think
Automatic response to the external enviroment to keep the body at a stab
What three components make up the automatic control system
Receptors,Coordination centre,Effectors
What is the nervous system
It allows organisms to to react to their enviroment and coordinate their behaviour
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What makes up the nervous system explain each section
The Central nervous sytem consists of the brain,spinal cord and sensory neurones and motor neurones.
Sensory neurones carry information as electrical impulses from receptors to CNS
Motor neurones carry electrical impulses from the CNS to effectors
Effectors are all muscles and glands responding to nervous impulses.
What is a receptor and give an example
Receptors are cells that detect stimuli. There are many different types like taste on the tounge. They can form much larger complex organs like the retina in your eyes.
What is an effector
Effectors respond to nervous impulses to bring change. They are glands and muscles. The glands may secrete something and the muscles may contract or relax.
What is the CNS
It receives information from sensory neurones. The CNS decides what to do with it. It sends that information to the muscles or glands in the body to act out
