The Autonomic Nervous System

whats the PNS subdivided into

somatic and autonomic

what is the SNS function

includes nerves which transmit infomation

where do the nerves transmit infomation

• to skeletal muscles

• from sense organs and skin

• under conscious control

what is the ANS

• nerve pathways which connect to internal organs and glands

what does the parasympathetic output in the ANS arise

craniosacral origin

what does the sympathetic output in the ANS create

rhoracolumbar

what is dual inervation

when many organs recieve input from parasympathetic and sympathetic nerves

dual innervation in pupils

• sympathetic : dilate

• parasympathetics ; constricts

dual innervation in heart

=-sympathetic : increaes rate and frce of contraciton

• parasympathetic- decreases only

  =

dual inmervtion GI tract

sympathetic reduces ability
parasympatheirc increases activity

Autonomic neuron types

1. preganglionic neurons

2. post ganglionic neurona

what happenes to automic neurotransmiters at the ganglita

both use acetylcholine as the transmitter

what happens to autonomic neurotransmitters at the organ

the parasympathetic system uses acetylcholne

the sympatheric system uses nodrenaline

what does the adrenal medulla secrete

aldosterone

what are the major PNS reactions

what happens to your heart rate, blood pressure and sweat in the sympathetic nervous system

they all increase

what happenes to saliva production and peristalsis in the sympathetic nervous system

saliva production decreases
peristalsis slows

what happens to heart rate,blood pressure and sweat in the parasympathetic nervous system

they decrease

what happens to saliva production and perisalis in the parasympatheirc nervous system

saliva production is stimulated

peristalsis speeds up

what is activated under conditions of stress anxiety and fear or excitment in the sympathetic nervous system

fight or flight

what happens during fight or flight (2)

1. increased cardiac output

2. blood flow away from viscera

functions of sympathetic nervous system

• increase in heartrate

• increase in blood sugar

functions of parasympathetic nervous system

• decreased cardiac output

• bladder contraction

autonomic nervous system receptors (2)

• cholinergic

• adrenergic

types of adenergic receptors (2)

• alpha

• beta

types of cholinergic receptors

• nicotinic

• muscarinic