reorganise later Flashcards
(20 cards)
what are the two categories of drugs for nervous system conditions?
agonist and antagonist
how can Parkinson’ disease be treated?
the drug L-dopa raises levels of dopamin, reducing muscle tremor
which neurotransmitter is asscoiated with depression?
serotonin
which neurotransmitter is asscoiated with Parkinson’s disease?
dopamine
What happens to neurotansmitters after they have stimulated the postsynaptic neurone?
they are reabsorbed, broken down, and recycled
What happens when the postsynaptic neurone is stimulated?
depolarisation occurs, triggering an action potential
What do neurotransmitters do?
diffuse across the synaptic cleft from the presynaptic neurone to the postsynaptic neurone
What is the synaptic cleft?
the gap between the two neurones
What is a synapse?
a junction between two nerve cells
What happens in a synapse?
a neurotransmitter carries the nerve impulse from one neurone to the next
What are the points on an ECG known as?
PQRST
What is saltatory conduction?
when calcium ions jump between nodes of ranvier along a neurone
What is hyperpolarisation?
after the action potential the membrane becomes more polarised than usual
What is repolarisation?
at -40 mA the sodium channels close and the potassium ion channels open so potassium ions diffuse out of the neurone and the membrane returns to resting potential
What is the resting membrane potential?
-70 mA
What is the threshold potential?
-60 mA
What is the resting membrane potential?
-70 mA
How do myelinated and non-myelinated neurons differ?
Myelinated have myelin sheaths and carry impulses faster
How do fast and slow twitch muscle cells differ?
slow twitch are darker because they contain more myoglobin; contain less glycogen; contract and fatigue slowly; have lots of mitochondria for aerobic respiration; smaller sarcoplasmic reticulum
