Reflexes Flashcards
Reflexes are automatic to certain …?
Stimuli-they can reduce the chances of being injured.
Why do we have reflexes?
Because sometimes our brain is too slow.
If someone shines a bright light into your eye, what happens?
Your pupils automatically get smaller.
What is the human reflex when you gets shock?
Your body releases the hormone adrenalin automatically.
What is the route called which is taken by the information?
Reflex arc.
The reflex arc goes through which system?
Central nervous system.
Where do the neurones in reflex arcs go through? (2)
The spinal chord or through an unconscious part of the brain.
Give an example of a stimulus…
A fire (hot object).
What happens when a stimulus is detected by receptors?
An impulse is sent along a sensory neurone to the CNS.
In the CNS the sensory neurone passes on the message to another type of neurone called…?
A relay neurone
What is the gap called between two neurones?
a Synapse.
How do messages pass across synapses?
Chemicals.
What are the names of the chemicals which pass messages between the synapses in the brain?
Neurotransmitters
Suggest why it’s important for animals to be able to detect changes in their external environent
So they can respond to the changes in order to avoid danger/increase their chances of survival
Cells in the sense organs detect stimuli. What name is given to these cells?
Receptor cells
Name the stimulus, sense organ and effectors when a hungry animal see a source of food and it moves towards it?
Stimulus: meat (food)
Sense organ: eye
Effectors: muscle cells
The nervous system coordinates responses to stimuli. Name the other other communication system in the body that coordinates responses to stimuli?
Hormonal system
Two parts of the body which make up the central nervous system…
- brain
- spinal cord
Why type of neurone carries information from the sense organs to the central nervous system?
Sensory neurones
Why can the central nervous system produce very rapid responses to stimuli?
Information is transmitted using high speed electrical impulses.
What do you do to make a test fair?
Replicates
Why is a reflex reaction faster than a voluntary reaction?
It happens without time being spent thinking about a response.
Why are reflex reactions useful?
No time is wasted and you can quickly move out the way of danger.
What is the name given to the small gap between neurones?
Synapse
