the nervous system

Created by

Oriza

Cards (30)

what is the nervous system
the nervous system allows us to react to our surroundings and coordinate actions in response to stimuli
what is a stimuli  
changes in the environment
what are the different types of receptors
taste receptors on the tongue and sound receptors in the ears
receptors can also be part of complex organs which are
retina of the eye is covered in light receptor cells
what do effectors respond to
effectors respond to nervous impulses and bring about a change
what is known as effectors
muscles and glands
what is the first step of the nervous system
receptor cells convert a stimuli into an electrical impulse
what is the second step of the nervous system
the electrical impulse travels along cells called sensory neurones to the cns
what is the third step of the nervous system
the information processed, the appropriate response is coordinated an electrical impulse being sent along the motor neurone to the effector
what is the last step of the nervous system
the effector carries out the response this may be muscles contracting or glands secreting hormones
what is a reflex
automatic response which take place before you have time to think
why are reflexes important
prevents the individuals from getting hurt
explain why reflex arc is different from usual response to stimuli
because the impulse des not pass though the conscious areas of your brain
what is the first step of reflex arc
a stimuli is detected by receptors
what is the second step of the reflex arc
impulses are sent along a sensory neuron
what is the third step of the reflex arc
in the cns the impulse passes to a relay neuron
what is the last step of the reflex arc
the impulse reaches an effector resulting in the appropriate response
what is the order of the nervous system
stimulus- receptor- sensory neuron- relay neuron- motor neuron- effector- response
give examples of reflex arcs
pupil getting smaller to avoid damage from bright light light. moving your hand from a hot surface to prevent damage.
what is a synapse  
gaps between two neurons
how do synapses work
the nerve signals is transferred by chemicals which diffuse across the gap. these chemicals then set off a new electrical signal in the next neuron
what is a reflex action 
a rapid , automatic response to a stimulus that doesn't involve the conscious part of the brain
what do nerve cells (neurons) carry
it carries electrical impulses from one place to another
what does sensory neuron carry  
carries information as electrical impulses from the receptor to the cns
what do motor neurons carry  
electrical impulses from the cns to the effector
what does relay neuron do 
connects sensory neurons to motor neurons
adaptations of axons 
insulated by a fatty sheath, long so can carry messages throughout the body
what does dendrite do  
branches of neurons that receive signals from other neurons
what is the order of the electrical impulses from receptor to effector
sensory neuron, relay neuron, motor neuron
what are reflexes
a rapid response to certain stimuli that don't involve the conscious part of the body