Autonomic Nervous System Flashcards
What is the ANS responsible for the regulation of?
involuntary movements
The 2 divisions of the ANS are
Sympathetic and parasympathetic
Which division of the ANS is responsible for the “fight or flight” response?
sympathetic
The neurotransmitter released by sympathetic postganglionic neurons is
norepinephrine
What are examples of a target organ of the sympathetic division?
blood vessels, heart, adrenal glands
The neurotransmitter released by parasympathetic postganglionic neurons is
ACh
The parasympathetic division of the ANS is responsible for
constriction of pupils
increased gi motility
decreased heart rate
increased saliva
Which are some functions of the ANS?
Regulation of heart rate
control of digestion
regulation of bp
The autonomic ganglia are located
outside the CNS
The sympathetic division of the ANS is responsible for
dilation of bronchioles
dilation of pupils
decreased salivation
constriction of certain blood vessels
the parasympathetic division of the autonomic nervous system is dominant during
relaxation and digestion
The sympathetic chain ganglia are located
near the spinal cord
What are some characteristics of the parasympathetic division?
decreased heart rate
constriction of pupils
increased salivation
The adrenal medulla is an example of a
sympathetic ganglion
The ANS is primarily regulated by the
brainstem
The preganglionic neurons of the sympathetic division originate from the
lumbar and thoracic spinal cord
What are the functions of the sympathetic division?
dilation of bronchioles
The sympathetic division is activated in response to
stress and emergencies
The ANS regulates
involuntary movements
The parasympathetic division is associated with
relaxation and conservation of energy
The neurotransmitter released by sympathetic preganglionic neurons is
ACh
Define Receptor
a cell or group of cells that receive information from a stimulus
Define Effector
an organ, muscle or gland that responds to the control of an autonomic or somatic or endocrine signal
Parasympathetic nervous system
PNS
Rest and digest, sometimes referred to as the craniosacral division of ANS because of the pregnaglionic neurons