Human Responses to the Environment (Grade 12 NSC Matric Life Sciences): Flashcards
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10 cards from this deck
Peripheral nervous system (PNS)
Peripheral nervous system (PNS)
All nerve pathways outside brain & spinal cord
PNS composition
PNS composition
12 pairs cranial nerves + 31 pairs spinal nerves
Somatic nervous system controls
Somatic nervous system controls
Voluntary/skeletal muscles
Somatic system responds to
Somatic system responds to
External environment changes
Autonomic nervous system controls
Autonomic nervous system controls
Involuntary actions (heart rate, breathing, digestion)
Sympathetic nervous system role
Sympathetic nervous system role
'Fight or flight' emergency response
Sympathetic responses include
Sympathetic responses include
↑ heart rate, wider airways, dilated pupils, ↑ sweat, ↓ digestion
Parasympathetic nervous system role
Parasympathetic nervous system role
'Rest & digest' - returns body to calm state
Parasympathetic responses include
Parasympathetic responses include
↓ heart rate, ↑ digestion, constricted pupils, bladder contraction
Antagonistic control means
Antagonistic control means
Sympathetic & parasympathetic have opposite effects on same organs