Lecture 7 - Nervous System 2 Flashcards
Which of the following are part of the peripheral nervous system
Motor neurone
What is the neurotransmitter
Chemical messenger
Describe. The structure and feature of a neurone
They are mylienated because it protects and prevents the electrical impulse’s from escaping
Dendrites extend from the cell body
What is the synapse
Gap between two neurones
What is presynaptic neurone
Before the synapse
What the receptors do
The receptors they detect the neurotransmitter and release sodium and causes something to generate in the second neurone
The synapse
You get an impulse
Travel at a neurone
Triggers the calcium two cahnnels
Enters in and releases vesicles
Vesicles merge with membrane
Explain why neurones can only transmit information in one direction At the synapse
Only present in the postsynaptic membrane
Neurotransmitter goes from high to a low
Cholinergic synapse
Ach = acetylcholine
Action potential
Voltage gated calcium ion channels open
Calcium ions diffuse in
Synapctid vesicles fuse
Vesicles release ach
Diffuses and binds
Soundness channels open
Action potential is generated
Ach broken down
Disruption of synaptic transmission
Drugs , toxins , poisons
Same shape as neurotransmitters
Mimic action
What is dopamine
Dopamine is released endorphine
Nicotine causes dopamine to be released
It causes relaxed pleasure
Motor neurone disease
Transmits signals to muscle cells causing them to contract
Degeneration of motor neurone
Muscles weakens stiffen etc
What does dopamine stimulate the post synaptic me membrane
Dopamine diffuses across synapse
Attaches to receptors on post synaptic membrane
