Nervous System Flashcards
CNS consists of
brain and spinal cord
CNS function
interpreting info and making decisions
PNS consists of
all the other nerves
PNS function
message transport system
what does a nerve consist of
dendrites, cell body, axon, mylein, axon terminal
function of nerve
receives and send messages from the body to the brain and vice versa
purpose of mylein
to quicken the nerve signals
what cells make mylein
CNS - oligodendrocytes
PNS - schwann cells
what are action potentials
rapid change in voltage across membrane
sodium/potassium in cell
more potassium on inside
action potential method
threshold met - depolarisation (sodium moves into cell) - membrane potential rises to +30 - sodium channels close, potassium ones open - repolarisation - channels close, return to resting potential
rare synapse
electrical
chemical synapse
action potential arrives at axon terminal - neurotransmitter released into synaptic cleft - binds to receptors - receptors open allowing specific ion to move across
frontal lobe
motor movement, predicting outcomes
temporal lobe
speech, hearing, memory
occipital lobe
vision
parietal lobe
sensory perception
brain stem function
breathing, consciousness, blood pressure, heart rate, and sleep.
components of relfex arc
stimulus, sensory neuron, receptor, motor neuron, effector, response
parasympathetic NS
rest and digest
sympathetic NS
fight or flight
role of ANS in homeostasis
regulation of blood pressure, responses to food
key role of sympathetic system
responding to dangerous or stressful situations
key role of parasympathetic system
decreases respiration and heart rate and increases digestion
