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how much does the brain weigh?
3 lbs
function of a neuron
process info to transmit it to different neurons, glands, and muscles
what are the parts of a neuron?
dendriters (branch looking thing)
saulma/cell body
axon long and skinny part
mylin sheath (sausage looking thing)
dendrite function
receives info from other neurons
saulma/cell body function
collects and combines info received. sends nerve impulses to the axon
axon function
carries messages to other glands/muscles
what are nerve cells surrounded by/made up of?
potassium and sodium ions
resting potential def
small electrical charge found outside the membrane
how does myelin impact a nerve impulse?
increases the speed of the impulse
action potential def
nerve impulse triggered as a result of neurons electrical charge reaching the threshold
first person to measure the speed of a nerve impulse
Hernan Helmholtz
HH fast impulse
what gets released when an impulse hits the bottom of an axon?
neurotransmitters are released
synapses def
small spaces bwtn neurons
what are the different nerveous systems in the human body?
central nervous system
peripheral nervous system
what does the central nervous system consist of?
brain
spinal chord
what does the peripheral nervous system consist of
somatic system
autonomic system
what does the somatic system (in peripheral) do?
carries messages to and from the brain to different body parts
what does the autonomic system do? (in peripheral)
sympathetic + autonomic system
what is the corticalization of the brain?
wrinkles and fissures on the brain
what connects the two hemispheres of the brain?
corprus collosum
left hemisphere responsibilities
speaking, writing, language comprehensions
math
right hemisphere responsibilities
creative, artistic, recognizing visual patterns, facial expressions
