anatomy

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