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Stimulus meaning
How a stimulus works
More on sensory receptors
Stimulus= visible light
Stimulus: sound
stimulus: pressure
Stimulus: heavy pressure
Stimulus: chemical pt1
Stimulus: chemical pt2
Stimulus: temperature
Stimulus: gravity
The nervous system has 2 parts- part 1- CNS
CNS- spinal cord description
The nervous system has 2 parts- part 1- PNS
PNS pt 2
The reflex arc
Reflex action
Elements of reflex arc
put diagram of reflex arc
reflex arc example
Reflex arc- example pupil reflex
do diagram of spinal column-neurones
nerve nets-evolution
Nerve net is the simplest type of nervous system- it's a diffused (distributed) network of cells that groups into a ganglia but doesn't form a brain
nerve net- cell types
Hydra nerve net
hydra- nerve net- ectoderm
compare hydra to human
Neurones-description
3 types of neurones
Cell body/ centron function
Cytoplasm function
Nucleus function
Nissl granules
Dendrite function
Axon function
Schwann cells function
Myelin sheath function
Nodes of Ranvier function
synaptic knob function
Axon ending/ terminal function
nervous impulse- resting potential
nervous impulse- potential difference
reason for resting potential 1
What are sodium- potassium exchange pumps
reason for resting potential 2
Reason for resting potential-3
Other reasons for resting potential
Action Potential Definition
The action potential
Oscilloscope function
conclusions drawn using oscilloscope
conclusions drawn using oscilloscope pt 2
Depolarisation definition
How action potential travels along axon
Absolute refractory period
Relative refractory period
Properties of nerves/impulses- 'All or nothing'
All or nothing law effect
Factors affecting speed of conduction of nerve impulse- temp
Factors affecting speed of conduction of nerve impulse-Diameter of axon
Factors affecting speed of conduction of nerve impulse-Diameter of axon pt 2
Factors affecting speed of conduction of nerve impulse- myelination
Factors affecting speed of conduction of nerve impulse- myelination pt 2
2 parts of the nervous system
Nerves
Basic pattern of spinal nerves- dorsal and ventral root
Voltage gated channels
Terms- simple
Refractory period- general
Ventral root
Dorsal root
What you see on an oscilloscope
What you see on an oscilloscope pt 2
Role of synapse
Impact of drugs pt 1
Impact of drugs pt 2
Nicotine
Nicotine- how you become addicted
Organophosphate
Organophosphates- effects
Psychoactive drugs
