The nervous system Flashcards
What is the nervous system
An organ … in animals that allows them to … to c… in their e….
An organ system in animals that allows them to respond to changes in their environment
What are the different parts of the nervous system
-c
-s
-m
-e
-central nervous system (CNS)
-sensory neurones
-motor neurones
-effectors
What are receptors
Cells that detect stimuli
What do effectors do
Respond to n… impulses and bring about a …
Respond to nervous impulses and bring about a change
What are the 2 types of effectors
Muscles and glands
How do muscles respond to nervous impulses
Muscles contract and relax
How do glands respond to nervous impulses
Glands secrete hormones
What does the CNS do
Receives … from the r… and coordinates a … which is carried out by the …
Receives info from the receptors and coordinates a response which is carried out by the effectors
Order that the CNS coordinates a response
- S…
- Receptors are …
- … neurones carry info from … to the CNS
- … processes info and coordinates a ….
- … neurones carry info to …
- Effectors carry out a …
- Stimulus
- Receptors are stimulated
- Sensory neurones carry info from receptors to the CNS
- CNS processes info and coordinates a response
- Motor neurones carry info to effectors
- Effectors carry out response
What’s do synapses do
Connect neurones
What is a connection between 2 neurones called
A synapse
How does information pass across one neurone to another
-The n… signal is transferred by c… which … across the gap
-these c… set off an electronic s… in the next n….
-The nerve signal is transferred by chemicals which diffuse across the gap
-these chemicals set off an electronic signal in the next neurone
What are reflexes
Fast, a… responses to certain s… that don’t involve the c… part of the brain
Fast, automatic responses to certain stimuli that don’t involve the conscious part of the brain
What is a reflex arc
The passage of i… in a r… from a receptor to an e…
The passage of info in a reflex from a receptor to an effector
Where do the neurones go in reflex arcs
Through the spinal cord or through an unconscious part of the brain
How a reflex works:
1.a s… is detected by r…
2.impulses are sent along a … neurone to a … neurone to the C…
3.when the impulses reach a … between the S…and R… neurone they trigger c… to be released
4.these chemicals cause i…. to be sent along the relay n… across the synapse to the … neurone
5.impulses travel along the motor neurone to the …
6.the effector carries out the …
1.a stimulus is detected by receptors
2.impulses are sent along a sensory neurone to a relay neurone to the CNS
3.when the impulses reach a synapse between the S and R neurone they trigger chemicals to be released
4.these chemicals cause impulses to be sent along the relay neurone across the synapse to the motor neurone
5.impulses travel along the motor neurone to the effector
6.the effector carries out the task
What are reflexes quicker
Because you don’t think about the response, they go through the spinal cord or unconscious parts of the brain
Investigations for reaction time
- Using a computer eg clicking a mouse
—> computers give a more precise reaction time
—> remove human error - Dropping a meter stick with someone who has and hasn’t had caffeine
