Functions of ANS
maintains basal activity
responds to changes in the organs
monitors level of activity
coordinates functions of internal organs
controls supply of nutrients
removal of waste
ensure constant monitoring and control of the interna viscera
sensory receptor activated by changes in the environment
informs CNS vis sensory nerves
dual innervation of ANS
Parasymapthetic and Sympathetic
Pregangliconic and postganglic differ in origin motor responses, properties, location.
Differences between the 2 motor limbs
NEUROTRANSMITTER = Acetylcholeic stimulates nicotonic receptors in both nerves
the difference in the motor limbs is the neurotransmitter
Sympathetic = noadrenaline
Parasympathetic = Acetylecholine
They activate different protein receptors.
Noadrenalines adrenoreceptor is Acetylcholine = Musannic receptor.
A1- smooth muscle contraction
A2 - adrenegic nerve endings
B1- cardiac muscle - increases rate
B2 - smooth muscle relaxes airways
M1- Parietal cells - stomach acid secretion
M2 - cardiac muscles - reduction heart rate
M3 - smooth muscle - secretion and smooth muscle contraction.
Interneuronic in the CNS also integrate sensory info
Both motor nerves provide the dual ineration in tissues
Essential to regulation of effector.