The Nervous System Flashcards
2 functions of the NS
- collect, process and respond to enveronmental information
- coordinate the working of different organs, glands and cells
% of neurons in the brain
~80%
2 mai parts of the NS
central nervous system and peripheral nervous system
2 parts of the CNS
brain and spinal cord
what type of control does the brain have?
contralateral
function of the cerebral cortex
higher processing like problem solving, decision-making abd thinking
cebral cortex thickness
~3mm
brain stem functions
- controls basic functions like sleep and breathing
- connects brain to spinal cord and PNS
functions of the spinal cord
controls reflex actions and passes signals between the body and brain via the PNS
2 parts of the PNS
autonomic nervous system and somatic nervous system
2 divisions of the autonomic NS
sympathetic nervous system and parasympatheic nervous system
function of the ANS
sends/receives messages to/from organs and glands and cntrols survival functions by regulating glands, blood vessels, organs
does the ANS require conscious attention?
no
function of the sympathetic NS
activates physiological arousal to prep for f/f to cope with stress
parasympathetic NS function
bring body back to homeostasis and a natural steady state after stress has passes, by balancing body’s processes
what body functions are increased by the sympathetic division?
HR, BP, breathing rate, muscle tension
function of the SNS
controls skeletal muscles to control voluntary muscle movements
2 branches of the SNS
motor branch and sensory branch
pathways, controls, control centre
3 differences between the ANS and SNS
- ANS = only motor pathwyas, SNA = sensory adn motor pathways
- ANS controls internal organs and glands, SNS controls skeletal muscle and movement
- ANS control centres in the brain stem, SNS control centre in the motor cortex
