Flashcards in Maciej Nervous system Maciej Deck (10):
1
Define 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
2
What three conditions does the body need to maintain at a constant level ?
Water levels, blood-glucose concentration, temperature
3
In the bodies response system, what are the receptors ?
Receptors are parts of the body that detect changes in the environment (a stimulus)
4
In the bodies response system what are the co-ordination centres ?
Parts of the body which process the information from the receptors e.g. (brain, spinal cord, pancreas)
5
In the bodies response system, what is the effector ?
The part of the body that initiates a response based on the change
6
Describe the pathway of a nervous system response
-A stimulus is detected by a receptor
-An electrical impulse is sent via the sensory neurone to the central nervous system (brain or spinal cord)
-The central nervous system sends an electrical impulse via the motor neurone to the effector
-The effector issues a response
7
Why is there a gap between neurones and what is it called ?
-The tiny gap is called a synapse
-The synapse makes sure that the electrical impulse travels in only one direction
8
What are reflex actions ?
Reflex actions are fast automatic responses, they do not initially involve the brain but rather the spinal cord
9
What is the pathway of an electrical impulse during a reflex action called ?
Reflex arc
10