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What are the systems of the Autonomic Nervous System?
- Sympathetic (SNS)
- Parasympathetic (PNS)
What are the functions of the Parasympathetic Nervous System?
- Slow heart rate
- increase gastric secretio
- nempty bladder
- empty bowel
- Focus eye
- constrict pupil
- contract bronchial smooth muscle.
Function of NicotinicN receptors when activated
- Release of ACh and NE from postganglionic nerves to various organs.
- Release of Epi from Adrenal Medulla.
Function of NicotinicM receptors when activated
Skeletal muscle contraction
Function of Muscarinic Receptors when activated
- Eyes: Pupilary contraction (miosis)
- Heart: Decrease HR
- Lung: Bronchial dilation, increase secretions
- Bladder: Contraction of SM on bladder wall and relaxation of sphincter ---> elimination
- GI: Increased salavation and gastric secretions
- Increased intestinal motility/tone ---> defecation
- Sweat Glands: Increased sweating
- Blood Vessels: Vasodilation
Function of Alpha1 Receptors when activated
- Eyes: contraction of radial muscle in pupil ---> pupilary dilation (mydriasis)
- Blood Vessels: Vasoconstriction
- Male Sex apparatus: ejaculation
- Urinary Bladder: contraction of sphincter ---> decreased elimination.
Function of Alpha2 Receptors when activated
- Nerve terminal feed back loops regulate the release of neurotransmitters like NE.
- Various CNS functions.
Function of Beta1 Receptors when activated
- Heart: Increased HR and force of contraction
- Kidney: Release of renin ---> release of angiotensin ---> vasoconstriction ---> increased BP
Function of Beta2 Receptors when activated
- Lungs: Bronchial dilation
- Uterus: Relaxation of smooth muscle
- Arterioles of Heart, Lung, and Skeletal Muscle: Vasodilation
- Liver: Glycogenolysis ---> increased blood glucose
- Skeletal Muscles: Glycogenolysis ---> increased blood glucose
- Enhanced contraction
Function of Dopamine receptors when activated
- Kidney: dilates renal blood vessels ---> increased kidney function.
- CNS: various functions