ANS Flashcards
What is the Autonomic nervous system
Control centre in body therefore processes pharmalogical targets
Two types of cells
Neurones - convey message
Neuralgia - support and protect
What are neurones
Neurones form nerves
Unequal k+ and Na+ lead to different electrical charge
Membrane of resting potential
What is action potential in nerves cells
Neurone > Axon > away from body
Nerves fire -> depolarised
Active - Depolarised (cell is positive)
Non active - polarised (cell is negative)
Action potential
Na+ rush in
Flips the charge (depolarised)
K+ floods out
Charge flips
Na+ and K+ pumps work for it go back to normal
What is Saltatory conduction
Occurs in myelinated nerves
Increases conductivity velocity
Impulse jumps from nodes of ranvier
Speed -distance travel per unit time
Velocity - distance per unit time and direction
Speed of nerve impulses rely on
Size and type of nerve
Large mylelinated -A fibres, fast motor, sharp stabbing acute - pain
Small unmyelinated- C fibres, slow, achy throbbing pain
How many groups of transmitters are there
Biogenic amines
Amino acids
Peptides
Other
What is antidromic conduction
Conduction back tracks
urticaria causes red patches/ hive
What is a synapse
a junction between two nerve cells, impulses pass by diffusion of a neurotransmitter
frequency nerve impulse-neuro transmitter-vesicle release
What is the autonomic nervous system
Principally efferent system transmitting impulses
CNS- Peripheral organ system
Parasympathetic- steady and slow
sympathetic= fight or flight
What are the main characteristics of the PNS
Long - pre ganglionic fibres
Short- post ganglionic fibres
neurotransmitter is acetocholine
Responsible for cholinergic transmission
the ligand is cholinergic it can produce alter or release ACH
What are the characteristics of the Nervous system
fight or flight
A+B responses
neurotransmitter ACH- pre ganglionic- norad- post
Summary
ANS responsible for homeostasis
involuntary control
parasympathetic and sympathetic
Parasympathetic - conserves energy
Sympathetic- fight or flight
Summary 2
ACH through parasympathetic
ACH preganglionic + Norad
Nicotinic and muscarinic receptors in parasympathetic
A+b receptor in sympathetic
