B17 Nervous system Flashcards
What is the function of the nervous system?
Enables humans to react to their surroundings
Coordinate behaviour
Name the organs found in the central nervous system
Brain
and
Spinal cord
Define the term stimulus
A change in the environment that is detected by a receptor
Name the organ that contains receptors that detect gases in the air
Nose
Name the organ that contains receptor detecting light
Eye
Name the organ that contains receptors that detect pain
Skin
Name the neurone that carries an electrical impulse from the receptor to the central nervous system
Sensory neurone
Name the type of cell shown in the picture
Motor neurone
What is the function of the CNS?
Central nervous system
Coordiantes the response to a stimulus
What passes along the neurones in the nervous system?
Electrical impulses
Give the sequence of events tin the nervous system
Stimulus -> Receptor -> Coordinator -> Effector -> Response
How does a stimulus lead to a response being carried out by the body?
Stimulus is converted into an electrical impulse by the receptor
Electrical impulse passes along sensory neurone to central nervous system
The CNS coordinates a response
Electrical impulse passes along a motor neurone to an effector
Effector carries out a response
What is the fucntion of the sensory neurone?
Carries electtrical impulses from the stimulus to the spainl cord
Give the fucntion of a motor neurone
Carries electrical impusles from the central nervous system to the coordinator
The diagram shows the central nervous system
Name organ A and B
A = brain
B = Spinal cord