The nervous system and homeostasis

Subdecks (1)

what is the function of the nervous system?
It enables organisms to react to their surroundings and coordinates behaviour
What are the two parts of the central nervous system?
Brain and spinal cord
Why are reflex actions rapid and automatic?
They do not involve the conscious part of the brain
Why are reflex actions important?
For survival and to prevent damage to the body
The order of the pathway of a nervous response is:
The stimulus, the receptor, the coordinator, the effector and then the response
What is a stimulus?
a change in the internal or external environment
What is a synapse?
The junction between two neurones where chemicals are released, allowing impulses to cross
What is the function of neurones?
they carry electrical impulses around the body
What is homeostasis?
The maintenance of a constant internal environment
Why is homeostasis important?
Maintains optimal conditions for cell and organ function, and enzyme activity
Give three internal conditions controlled in homeostasis.
body temperature
Blood glucose concentration
Water levels
Give three things all control systems include
receptors, coordination centres, effectors
Name three coordination centres
brain, spinal cord, pancreas
Name two types of effectors
Muscles and glands
What is a receptor?
A cell that detects stimuli (a change in the environment)
What are coordination centres?
receive and process information from receptors
What are effectors?
carry out the response to restore optimum conditions