13.6 Organisation Of The Nervous System Flashcards
CNS
Brain and spinal cord
PNS
All neurones that connect CNS to rest of the body
Sensory and motor neurones
2 functional systems of nervous system
Somatic
Autonomic
Somatic nervous system
Under conscious control
Used when we voluntarily decide to do something
Autonomic nervous system
Works constantly
Under subconscious control - involuntary
Where does the somatic nervous system carry nerve impulses to?
Body’s muscles
Where does the autonomic nervous system carry impulses to?
Glands
Smooth muscle
Cardiac muscle
2 types of autonomic nervous system
Sympathetic
Parasympathetic
Sympathetic
Fight or flight response
Neurotransmitter is noradrenaline
Parasympathetic
Relaxing response
Neurotransmitter is acetylcholine
Characteristics of the neurones in somatic nervous system
Heavily myelinated axon
Single neuron from CNS to effector organs
Neurotransmitter - acetylcholine
Effector organ - skeletal muscle
Characteristics of the neurones in the autonomic nervous system (sympathetic)
Lightly myelinated preganglionic axons
Unmyelinated postganglionic axons
Neurotransmitter - noradrenaline
Effector organ - smooth muscle
Characteristics of the neurones in the autonomic nervous system (parasympathetic)
Lightly myelinated preganglionic axons
Unmyelinated postganglionic axons
Neurotransmitter - acetylcholine
Effector organ - smooth muscle
