3 Autonomic Nervous System (ANS) Flashcards
The autonomic nervous system is a part of the _____ portion of the ________ nervous system
Efferent, Peripheral
The autonomic nervous system controls what kind of activity in the body? What does it include?
Involuntary
Includes smooth muscle, secretory glands, visceral organs
T/F the autonomic nervous system functions to control homeostasis
True
The autonomic nervous system is divided into 2 systems. What are they?
Sympathetic - cholinergic
Parasympathetic - adrenergic
Name the 3 neurotransmitters of the sympathetic (adrenergic) nervous system.
Catecholamines:
Norepinephrine
Epinephrine
Dopamine
How is norepinephrine produced?
It is secreted from adrenergic fibres in the adrenal medulla
How is epinephrine produced?
It is converted from norepinephrine in the adrenal medulla
How is dopamine produced?
It is secreted from adrenergic fibres in the adrenal glands
The sympathetic nervous system causes what reaction in the body?
Fight or flight, stressed and dry
*Think of prey
How does the sympathetic nervous system affect the pupils?
It dilates them
What is the effect does the sympathetic nervous system have on glands, bladder contraction, and peristalsis
It inhibits them
How does the sympathetic nervous system affect the cardiovascular system?
Increases HR
Increased BP due to vasoconstriction
How does the sympathetic nervous system affect the respiratory system?
it causes bronchodilation to allow more airflow
T/F the sympathetic nervous system does not initiate the conversion of glycogen to glucose
False
Adrenergic Receptors are…
Sites located all over the body where Adrenergic drugs bind and produce their effect
Adrenergic receptors are divided into which 5 categories?
Alpha 1
Alpha 2
Beta 1
Beta 2
Dopaminergic
Alpha-adrenergic receptors respond to which neurotransmitter?
Norepinephrine
Beta-adrenergic receptors respond to which neurotransmitter?
Epinephrine
Dopaminergic receptors respond to which neurotransmitter?
Dopamine
Which type of receptor is located post-synaptically on all SM, organs, and glands?
Alpha 1
Alpha 1 receptors are mainly responsible for which bodily response?
Vasoconstriction
Which type of receptor is located in the presynaptic terminals?
Alpha 2
Alpha 2 receptors mainly control which response?
They control the release of neurotransmitters. It is the stimulation of these receptors that causes an inhibitory effect on the SNS
Which type of receptor is located mainly on the heart?
Beta 1
Beta 1 receptors mainly control which response?
They increase HR and BP
Which type of receptor is located on the SM of the bronchioles, arterioles, and visceral organs?
Beta 2
Beta 2 receptors control which bodily response?
Mainly, they relax the bronchioles to increase airflow
Adrenergic drugs function to…
Either stimulate or inhibit the stimulation of the SNS
Drugs that stimulate the SNS are called…
Adrenergic agents or sympathomimetics
Drugs that inhibit/block the SNS are called…
Adrenergic blockers or sympatholytics
