Autonomic Physiology Flashcards
What does autonomic nervous system mean? what muscle type does it act on.
Means it controls the things you don’t think about
Smooth and cardiac
What does the somatic nervous system do? What muscle type does it act on
Controls the voluntary stuff, is sensory. Controls skeletal muscle
Autonomic vs Somatic;
Describe how specialized each it, the type of receptor used and if if they excite/inhibit the target
Somatic - is s a specialized NMJ, has ionotropic receptors and always excites target
Autonomic - Less specialized, used metabotropic receptors and may excite or inhibit
Talking now only about autonomic - what does the sympathetic system do?
Fight or flight - has coordinated effects
What does the parasympathetic system do?
Rest and digest - has independent effects
What spinal cord region does the sympathetic nervous system flow from?
Thoracic and Lumbar
In sympathetic - is the pre-ganglionic fibres longer or shorter than the post-ganglionic fibres?
Shorter - ganglia lies close to spinal cord
In the sympathetic - what acts on what receptor at the ganglia
Preganglonic fibres release acetylcholine (Ach) which act on nicotinic receptors
In sympathetic - what do post-ganglionic fibres release and what receptor does it act on?
Noradrenaline - acts on alpha or beta receptors
In parasympathetic - what spinal cord region do the fibres exit from?
Cranial and Sacral
In parasympathetic - are the pre-ganglionic fibres longer or shorter than post?
Longer - ganglia lies closer to target
In parasympathetic - what acts on what receptor at the ganglia?
Ach acts on nicotinic receptors
In parasympathetic - what do post-ganglionic fibres release and on what receptor?
Ach again on muscarinic receptors
Do postganglonic fibres always follow the rules?
No - some sympathetic fibres innervate sweat glands and some release non-adrenergic non-cholinergic transmitters
Of the two (paraS or S) which has the hormonal component?
Sympathetic
