Autonomic Nervous System Flashcards
The ANS is responsible for the control of:
smooth muscle, cardiac muscle, endocrine and exocrine glands
the somatic pathway from the CNS to the skeletal muscle effector involves only ____neuron
one
in the autonomic pathway from the CNS to effectors involves ____ neurons
the name of the neuron that has its cell body in the CNS and courses to the autonomic ganglion is called the ________ neuron
the neuron that has its cell body in the autonomic ganglion and carries the impulse from that ganglion to the effector is called the _________ neuron
two
preganglionic
postganglionic
the ANS is divided into two separate systems
sympathetic and parasympathetic
the sympathetic system involves all the thoracic and the first two sometimes three lumbar spinal cord segments, thus it is called the __________
thoracolumbar system
the parathsympathetic system involves cranial nerves ________ and the sacral spinal cord segments ______ thus it is called the ________
3, 7, 9, 10
s2, s3, s4
craniosacral system
sympathetic system has ____ preganglionic and ____ postganglionic fibers
short, long
parasympathetic system has _____ preganglionic and ______ postganglionic fibers
long, short
eye (iris)
sympathetic
parasympathetic
stimulates dilator muscles, dilates eye pupils
stimulates constrictor muscles; constricts eye pupils
glands (nasal, lacrimal, salivary, gastric, pancreas)
sympathetic
parasympathetic
inhibits secretory activity; causes vasoconstriction of blood vessels supplying the glands
stimulates secretory activity
sweat glands
sympathetic
parasympathetic
stimulates copious sweating
no effect
arrector pilorum muscles
sympathetic
parasympathetic
stimulates to contract (erect hairs, goosebumps)
no effect
heart muscle
sympathetic
parasympathetic
increases rate and force of heartbeat
decreases rate; slows and steadies heart
digestive tract organs
sympathetic
parasympathetic
decreases activity of glands and muscles of digestive system and constricts sphincters increased motility (peristalsis) and amount of secretion by digestive organs; relaxes sphincters to allow movement of food along tract
blood vessels
sympatheic
parasympathetic
constricts most vessels and increases blood pressure
little or no effect
