Study Set Content:
prepares you for "fight or flight" situations
sympathetic nervous system
Is an emergency system, this is use to mobilize the body for quick response and action.
"fight or flight" situations
WITH WHAT MAJOR RECEPTORS DOES THE SYMPATHETIC NERVOUS SYSTEM WORK???
ADRENERGIC RECEPTORS:
o Alpha 1 (1)
o Alpha 2 (2)
o Beta 1 (1)
o Beta 2 (2)
a1 receptor Norepinephrine
Smooth muscle, hypothalamus
Epinephrine
Smooth muscle
a2 receptor
Nerve endings, stomach, hupothalamus
Epinephrine
No interaction
B1 receptor Norepinephrine
Heart, fat cells, kidneys, brain (posterior lobe)
Epinephrine
Heart, fat cells, kidneys
B2 receptor Norepinephrine
No interaction
epinephrine
Lungs, arterioles, stomach, liver or pancreas, uterus, Skeletal muscle
Vasoconstriction, elevated blood pressure, mydriasis, decreased ability to defecate and/or urinate
a1 receptor
Vasodilation, lowers blood pressure, constipation
a2 receptor
Increased heart rate, increase cardiac output and force of contraction, increased conduction, lipolysis, release of renin, release of antidiuretic hormone
b1 receptor
Relaxation of smooth muscle (vasodilation, bronchodilation, constipation), increased glucose production and insulin release, contraction of skeletal muscle
b2 Receptor
The parasympathetic nervous system is predominant under tranquil conditions.
It slows the heart rate
o Lowers blood pressure
o Increases intestinal activity
o Constricts the pupils
o Empties the urinary bladder
The parasympathetic nervous system is also known as the
"rest and digest" system.
These action conserves energy, it reduces contractual forces of both cardiac and GIT. It reduces (blank) and (blank)
conduction velocity of the sinoatrial node, atrioventricular node.
The parasympathetic preganglionic neurons have cell bodies that are located in the brain stem and the
sacral spinal cord
What receptors does the parasympathetic system act upon???
Cholinergic receptors- muscarinic and nicotinic
