ans quiz Flashcards
proprioceptors
detects body position, located in tendons, joints, ligaments, muscles
chemoreceptors
respond to pH, CO2, ions
nociceptor
detects pain
baroceptor
detects pressure changes in walls of blood vessels
exteroceptor
responds to stimuli outside the body
photoreceptor
detects light
mechanoreceptor
responds to distortions of the cell membrane resulting from applied pressure
plexus
branching and merging of nerves
dermatone
region of skin controlled by single nerve
somatic ns
effectors: skeletal muscle
motor neuron path: 2 motor neurons
NT: achetyl chloine (Ach)
autonomic ns
effectors: smooth, cardiac & glands
motor neuron path: 3 motor neurons
NT released: Ach & epinephrine (E)
sympathetic ns
- short preganglionic fibers & long post fibers
- releases Ach in preganglionic synapses & epinephrine on target
- widely distributed & longer lasting
- originates in thoracic lumbar region
parasympathetic ns
- long preganglionic fibers and short post ganglionic fibers
- releases Ach in both synapses
- 75% of targets are controlled by vagus nerve in ps division
- originates in cranial sacral region
why is sympathetic response longer & more widely distributed?
epinephrine is released into blood stream by adrenal medulla and there is more branching of the nerves
role of sympathetic ns
mobilizes body for action
role of parasympathetic ns
system of maintenance and repair
control system for ANS
hypothalamus & medulla
target: eye
sympathetic: dilates
parasympathetic: constricts
target: lacrimal gland
parasympathetic: stimulates secretion
target: salivary glands
sympathetic: inhibits secretion
parasympathetic: stimulates
target: heart
sympathetic: stimulates rate & force (beta1)
parasympathetic: decreases rate
target: lungs
sympathetic: dilates tubes
parasympathetic: constricts tubes
target: sweat glands
sympathetic: stimulates secretion
target: blood vessels of skin
sympathetic: constrict smooth muscle shunting blood to core
target: liver, gall bladder, pancreas
sympathetic: increases catabolism
parasympathetic: increases anabolism
target: peristalsis
sympathetic: inhibited
parasympathetic: stimulated
target: sphincter constriction
sympathetic: stimulated
parasympathetic: inhibited
target: urinary bladder smooth muscle constriction
sympathetic: inhibited
parasympathetic: stimulated
target: adrenal medulla
sympathetic: stimulates secretion
which target tissues are soley innervated?
sympathetic: sweat glands, blood vessels, adrenal medulla
parasympathetic: lacrimal gland
