B6
- Created by: superlouasaur
- Created on: 21-04-15 17:52
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- B6
- The nervous system
- The nervous system detects and reacts to Stimuli
- Made up of different parts
- Central nervous system (Brain and spinal cord)
- Connected to the body by sensory neurones and motor neurones
- Sensory neurones- carry impulses from receptors to CNS
- Motor neurones- carry impulses from the CNS to effectors
- Effectors- muscles and glands respond to nervous impulses
- Central nervous system (Brain and spinal cord)
- CNS coordinates the response- like a processing centre
- Stimulus
- Receptor
- Sensory neurone
- CNS
- Motor neurone
- Effector
- Response
- Effector
- Motor neurone
- CNS
- Sensory neurone
- Receptor
- Neurones and synapses
- Information is transmitted around the body by neurones
- Electrical impulses pass along the axon of nerve cells
- The gap between two neurones is called a synapse
- information is transmitted from nerve to nerve through transmitter chemicals across synapses
- Ecstasy blocks sites where serotonin is reabsorbed
- Ecstasy is mood enhancing because of increase in serotonin
- Reflexes
- Involuntary responses
- Quick, do not require thought
- The route taken by information in a reflex (from receptor to effector) is called a reflex arc
- The reflex arc goes through the CNS
- Simple reflexes improve the chance of survival
- Respond to a stimuli in away that helps them to survive
- Involuntary responses
- Modifying and learning reflexes
- Reflex responses can be modified by the Brain
- Can modify a natural reflex responce
- Picking up a hot plate, putting down instead of dropping
- Reflex responses can be learned
- Pavlov's dogs
- Conditioned reflexes can increase chances of survival
- Brain development and learning
- The brain is interconnected neurones
- The brain becomes more developed with every new experiece
- Produces connections
- When experiences are repeated the pathways become stronger
- Learning skills and behaviour
- Being able to learn means you can adapt to new situations
- Complex animals are incredibly adaptable
- Simpler animals have less flexible nervous systems
- Some skills only develop at certain ages
- Communication
- Cerebral cortex
- Outer part of the brain
- Folds for extra surface area
- Plays a role in intelligence, memory, language and consciousness
- Being able to learn means you can adapt to new situations
- Studying the brain
- Studying patients with brain damage
- Can judge which part of the brain controls what by what effect it has and which part is damaged
- Electrically stimulating the brain
- Electrode in a part of brain, which ever part reacts shows different zones
- MRI scans
- Produces detailed pictures of the brain, stimulate parts of the brain then can see which are active
- Memory is the storage and retrieval of information
- Short term and long term memory
- Information needs to be repeated to be transferred to long term memory
- Memories that don't go from short to long are forgotten
- Studying patients with brain damage
- The nervous system
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