Unit 5- the autonomic nervous system

Parasympathetic

rest and digest

increased blood flow to digestive system

decreased heart rate

sympathetic division

fight or flight response

increased blood flow, heart rate and blood pressure

types of junctions of sympathetic division

1. Nerve projects to chain ganglion at same level as target effector

2. central neuron synapses with chain ganglion

3. spinal nerve continue to splanchnic nerves; synapse at one of the collateral ganglia

Preganglionic fibers

axons from central neuron that project to a sympathetic ganglion

they are short and myelinated

post ganglionic fibers

axons from a ganglionic neuron that projects to target effectors;

they are long and unmyeinated

what is the difference between sympathetic division and parasympathetic dividsion?

preganglionic fibers in the parasympathetic division are long and postganglionic fibers are short.

hypothalamus

control center for many homeostatic mechanisms/ atonomic nervous system

Amygdala

Part of the limbic lobe, responsible for emotions and memory; strongly connected to the hypothalamus.

Medulla

controls smooth and cardiac muscle of cardiovascular system through ANS

endogenous. chemcial

produced by the body

exogenous chemical

chemical introduced from outside the body

When drugs affect the paths, sympathomimet

a drug that enhances adrenergic function

when drugs mess up in sympatholytic

a drug that interrups adrenergic funeral

sypathomimetics

• May mimic norepinephrine, or

• Increase production and release of norepinephrine, and may

• Block reuptake of norepinephrine from synapses