Functioning of the Autonomic Nervous System Flashcards
What senses changes in the internal environment/ viscera
Interoreceptors
What senses changes in the external environment
Somatosensory
What is the difference between somatic and autonomic neurons
Autonomic
- 2 neurone chain, so there is synapse (at ganglia) before target = widespread action
What is sympathetic neurotransmission
ACh at pre ganglion
NAd at post ganglion
What is postsympathetic neurotransmission
ACh at both
What is somatic neurotransmission
Only ACh
What is neurotransmission in adrenal medulla
ACh at adrenal medulla
Then secrete Ad/NAd into serum
What is a continuum
State of person is combo of PNS and SNS
What organs are dual innervated and antagonistic
Heart
SNS: Increase HR and Contractility
PNS: Decrease HR and Contractility
GIT
SNS: Decrease gut motility
PNS: Increase gut motility
Pupil
SNS: Contraction of radial muscle: constriction
PNS: Contraction of circular muscle: constriction
BV to head and repro organs
SNS: Vasoconstriction
PNS: Vasodilation
What organs are singly innervated
Sweat Glands
Smooth Muscle - Increase SNS: Vasoconstriction
Cardiac muscle/Skeletal muscle - Increase SNS: Vasodilation
What happens in salivary glands
SNS: Viscous saliva
PNS: watery saliva
What organs are dually innervated and work together
Male Sex organs
PNS: Erection
SNS: Ejaculation
Give an example of interaction between autonomic and somatic
Focussing eyes on near object
ANS: Pupil/lens adjustment
Somatic: Eye movements
