Reflexes Flashcards
What is synapes
The junction between each neutron is called synapses
Why are reflex actions so important
So it can protect you eg burns, breathing, digestion ….
What is meant by ‘reflex action’
It is a fast, automatic response that occurs without conscious thought
What is the importance of the coordination of impulses by the brain in our response to change in the environment
Because there could be danger and can respond to the stimuli
What is the difference between a sensory and a motor neutron
A sensory neutron is where a nerve impulse is sent along once the receptors detects the stimulus.
A motor neutron is where a nerve impulse is sent once the brain/spinal cords has determined an appropriate response
What is a reflex arc
T is a sequence that bypasses the brain, it reduces the time between stimulus
What kind of signals does the brain send to increase and decrease heat loss
Shivering-to generate more heat in the muscles
Sweating-to cool skin
How does a synapse work
The two neutrons are not physically connected, so when a nerve impulse passes arrives at the end of one neutron
Eg. Sensory neuron
It releases a chemical into the gap. This chemical then binds two receptors on to the next neutron
Eg a relay neutron, triggering the next chemical impulse
How does the nervous system work
It is a network of specialised cells called neurons, grouped together in bundles that we call nurves. It enables the body to respond to changes in the environment to trigger the appropriate response
Name the sense organs
Receptor of light
Receptor for chemical forming smell
Receptors for changes in position
Receptors for touch, pressure, pain, temperature
Receptors for sound and detecting changes in position for blance
What happens in the reflex arc
Receptor Sensory neuron Relay neuron (Central nervous system) Motor neuron Effectors
What is a relay neuron
It connects the sensory neuron to the motor neuron through the spinal cord (sometimes in an unconscious part of the brain)
Describe the roles of Reseptors Scenery CNS Neuron Effectors In changes in the environment
The receptors are specialised nerve endings that detect these stimuli
Once it detects the stimulus, it sendes a nerve impulse along a sensory neuron
This cell takes the impulse towards the central nervous system, made of the brain and spinal cord. The central nervous system can coordinate an effective resonce
Once the CNS has detected an appropriate response, it sends another nerve impulse along a motor neuron
This takes the impulse to an effector organ, to carry out the impulse
