Nervous System The ANS and Simple Behaviour Patterns.
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Transcript of Nervous System The ANS and Simple Behaviour Patterns.
Nervous System:
Conscios activity
controlled by the voluntary (somatic) nervous system
Unconscious activity
controlled by the autonomic nervous system
Autonomic Nervous System
Sympathetic System
The motor neurones secrete noradrenaline at the synapse
Parasympathetic
The motor neurounes secrete acetylcholine at the synapse
Sympathetic
Causes the “fight or flight” Divert blood from the gut to the lungs, heart
and voluntary muscle Increase supply to the muscles The lungs absorb more oxygen More blood available for the heart and lungs
Parasympatheic
Prepare the body for rest Decrease heart beat rate Decrease ventilation rate Increase peristalsis in the gut, food can be
digested
Comparison of the sympathetic and parasympathetic nerovs systems
Feature Sysmpathetic Parasympathetic
Transmitter substance at synapses
Noradrenaline Acetylcholine
Heart rate Speeds up Slows down
Iris Dilates Constricts
movements of digestive tract
Slows down Speeds up
Sweating Stimulated Not stimulated
Affect on heart rate
Sympathetic nerves increase the rate of cardiac muscle contraction
Parasympathetic nerves relax muscles