13.6 Organisation of the Nervous System Flashcards
What are the two systems the mammalian nervous system is divided up into?
Central Nervous System, Peripheral Nervous System
What is the Central Nervous System (CNS) made up of?
Brain, Spinal Cord, Relay Neurons
What is the Peripheral Nervous System (PNS) made up of?
-All the neurones that connect the CNS to the rest of the the body.
-Sensory neurones which carry nerve impulses from the receptors to the CNS
-Motor neurones which carry nerve impulses away from the CNS to the effectors
What are the two different functional systems the peripheral nervous system is divided up into?
Somatic nervous system, Autonomic nervous system
What is the somatic nervous system?
Under conscious control, used when you voluntarily decide to do something, carries impulses to the body’s muscles
eg. when you decide to do a bicep curl
What is the autonomic nervous system?
Works constantly, under subconscious control, involuntarily, used when your body decides to do something automatically without you deciding to do it, carries nerve impulses to cardiac muscle, glands, smooth muscles (eg. walls of small intestine)
What is the autonomic system further divided up into?
Sympathetic nervous system, Parasympathetic nervous system
What is the sympathetic nervous system?
-Gets the body ready for action
-‘Fight or Flight’ system
eg. increase in heart rate
What’s neurotransmitter do sympathetic neurones release?
Noradrenaline
What’s neurotransmitter do parasympathetic neurones release?
Acetylcholine
What does the parasympathetic nervous system do?
-Calms the body down, relaxing responses
-‘Rest and Digest’ system
eg. Decreasing heart rate or breathing rate
Draw the table of summary or the mammalian nervous system
