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19 Cards in this Set

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  • Back
receptors
groups of specialised cells which detect changes in the environment (stimuli) and turn them into electrical impulses
stimuli
changes in the environment
sense organs
location of receptors; each organ has receptors responsive to different changes in the environment (to particular stimuli)
what are receptors in the skin sensitive to?
touch, pressure, pain, temperature
what are receptors in the tongue sensitive to
chemicals in food
what are receptors in the nose sensitive to?
chemicals in the air
what are receptors in the ear sensitive to?
sound and the position of the head
what are receptors in the eye sensitive to?
light
Central Nervous System
CNS
brain and spinal cord
what happens when a receptor is stimulated?
the receptor sends an impulse along the nerve cells - neurons- to the brain. The brain coordinates a response.
neurons
nerve cells
effector
any part of the body that produces a response
give some examples of effectors
a muscle in the arm contracting
a muscle squeezing saliva from the salivary gland
a gland producing a hormone
name three kinds of neuron
sensory neurons
relay neurons
motor neurons
sensory neurons
carry signals from receptors to the spinal cord and the brain
relay neurons
carry messages from one part of the CNS system to another
motor neurons
carry signals from the CNS to effectors
synapse
a tiny gap between 2 neurons. One neuron cause a chemical to diffuse across the gap causing the next neuron to emit an electrical impulse
reflex action
a rapid response to a stimulus that does not involve thinking