Ch9 ANS 3 Flashcards
What are blockers?
drugs that bind with a receptor but don’t activate it
agonists?
drugs that activate receptors
What do differences between receptor subtypes allow for?
allow design of drugs to bind with one subtype of receptor but not another
most significant effect of release of epinephrine from the adrenal medulla
stimulation of metabolism in cells throughout the body
What does the release of epinephrine from the adrenal medulla usually coincide with?
- release of norepi from sympathetic postganglionic neurons
because the sympathetic system is often activated as a whole
In addition to its effect on the metabolism, how does epinephrine work with norepi?
reinforces the effects of norepinephrine on most target organs
sympathetic nervous system does all of this:
- optimizes blood flow to organs
- regulates body temp and metabolic rate
- regulates activity of viscera
parasympathetic nervous system
uses a 2 neuron pathway from spinal cord to effectors
another name for parasympathetic pathway
craniosacral outflow
Why is the parasympathetic nervous system also called craniosacral outflow?
because preganglionic cell bodies are found in the nuclei of the brainstem and the sacral spinal cord
ganglia of the parasympathetic nervous system
- configuration
- location
- separate (unlike the interconnected ganglia of the sympathetic trunk)
- located near or in the target organs
principle functions of parasympathetic nervous system
- energy conservation
- storage
innervates the heart, smooth muscle of lungs, and digestive system
efferent fibers in the vagus nerve
What parasympathetic fibers innervate salivary glands?
cranial nerve VII and IX
What parasympathetic fibers innervate lacrimal gland?
fibers in cranial nerve VII
