The Human Nervous System (Grade 12 NSC Matric Life Sciences): Flashcards
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Central nervous system components
Central nervous system components
Brain and spinal cord
Cranium function
Cranium function
Protects brain - hard bony skull part
Cerebrospinal fluid role
Cerebrospinal fluid role
Liquid cushion absorbing shocks, provides nutrients
Grey matter contains
Grey matter contains
Neuron cell bodies and dendrites
White matter consists of
White matter consists of
Myelinated axons for faster signal transmission
Synapse definition
Synapse definition
Communication gap between neurons
Neurotransmitters function
Neurotransmitters function
Chemical messengers carrying signals across synapse
Somatic nervous system controls
Somatic nervous system controls
Voluntary movements of skeletal muscles
Sympathetic division role
Sympathetic division role
Fight or flight - prepares body for action
Parasympathetic division role
Parasympathetic division role
Rest and digest - promotes calm, restorative processes