Physiology Exam 1 Autonomic Nervous System

Front 1

Autonomic vs somatic NS

Back 1

Somatic only one neuron, ANS 2 neurons

Both use acetylcholine, ANS also NE after postganglionic cell

Front 2

Preganglionic neurotransmitter in ANS

Back 2

Acetylcholine

Front 3

Postganglionic neurotransmitter in ANS

Back 3

Acetylcholine and norepinephrine

Front 4

Compare and contrast autonomic and somatic nervous system

Back 4

Front 5

Is the preganglionic fibre longer in the sympathetic nervous system or parasympathetic nervous system?

Back 5

Parasympathetic

Front 6

Postganglionic fiber is longer in the

Back 6

Sympathetic NS

Front 7

Name three major differences between sympathetic and parasympathetic NS

Back 7

1. Sympathetic have short preganglionic fibres and longer postganglionic fibers. Parasympathetic are the opposite.

2. Parasympathetic has some nerves from the brain (CN III, VII, IX, and X) and then sacral spine (S2-S4), sympathetic entirely contained in spinal cord

3. Parasympathetic has ACh at both pre and postganglionic synapses, sympathetic has NE at postganglionic synapse

Front 8

Muscarinic receptors

Back 8

ACh receptors found after postganglionic

Metabotropic (slow)

Inhibitory and excitatory depending on subtype (M1-5)

Target tissues: Bronchoconstriction (M3), decrease HR (M2)

Atropine will inhibit

Front 9

Nicotinic receptors

Back 9

ACh receptors

Excitatory and fast

Postganglionic (sympa and parasympa)

Front 10

Name the three NE receptors

Back 10

Alpha - excitatory (except in gut)

Beta 1 - inhibitory

Beta 2 - Inhibitory

Front 11

Describe the ANS responses in the lung

Back 11

Front 12

What brain region exhibits a lot of control over ANS?

Back 12

Hypothalamus

Front 13

What is the main neural controller of the gut?

Back 13

Myenteric plexus

Can function independently

Front 14

Describe autonomic nervous system control of enteric nervous system

Back 14

PNS generally stimulatory, increases secretions, motility and blood flow (rest and digest).

SNS inhibitory reducing secretions and decreasing motility and blood flow