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Nervous system:
• ANS regulates everyday
requirements of vital
body functions without
conscious participation
of mind (involuntary)
Sympathetic and parasympathetic divisions
typically function in opposition to each
other. But this opposition is better termed
complementary in nature rather than
antagonistic. The sympathetic division
typically functions in actions
requiring quick responses.
• The parasympathetic division
functions with actions that do
not require immediate reaction.
• Consider sympathetic as "fight
or flight" and parasympathetic
as "rest and digest
Prepares body for physical action (Fight or
Flight):
– Increased heart rate
– Increased blood pressure
– Redistribution of blood flow - ↑ flow to skeletal
muscle, ↓ flow to skin and organs
– ↓ GI activity
– Dilation of pupils and bronchioles
– ↑ blood glucose
Opposite effects to SNS
• Prepares the body for feeding and digestion
– Slows heart rate
– Lowers blood pressure
– Promotes GI secretions
– Stimulates GI movement
– Constricts the pupil
– Empties bladder and rectum
Acetylcholine is the neurotransmitter for
parasympathetic division, act on muscarinic
and nicotinic receptors.
• Noradrenaline is the neurotransmitter for
sympathetic division, act on adrenoceptors
Nervous system:
• ANS regulates everyday
requirements of vital
body functions without
conscious participation
of mind (involuntary)
Sympathetic and parasympathetic divisions
typically function in opposition to each
other. But this opposition is better termed
complementary in nature rather than
antagonistic. The sympathetic division
typically functions in actions
requiring quick responses.
• The parasympathetic division
functions with actions that do
not require immediate reaction.
• Consider sympathetic as "fight
or flight" and parasympathetic
as "rest and digest
Prepares body for physical action (Fight or
Flight):
– Increased heart rate
– Increased blood pressure
– Redistribution of blood flow - ↑ flow to skeletal
muscle, ↓ flow to skin and organs
– ↓ GI activity
– Dilation of pupils and bronchioles
– ↑ blood glucose
Opposite effects to SNS
• Prepares the body for feeding and digestion
– Slows heart rate
– Lowers blood pressure
– Promotes GI secretions
– Stimulates GI movement
– Constricts the pupil
– Empties bladder and rectum
Acetylcholine is the neurotransmitter for
parasympathetic division, act on muscarinic
and nicotinic receptors.
• Noradrenaline is the neurotransmitter for
sympathetic division, act on adrenoceptors
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