Chapter 2 Flashcards
clinical death
no pulse or heartbeat; reversible
biological death
3-4 minutes w/o oxygen, brain damage
psychobiology
biological aspects to behavior/mental processes
what two systems are important here?
nervous and endocrine
neuron
basic building block of nervous system
neurogenesis
brain regrows new brain tissue, lifelong process
neural plasticity
ability of brain to adapt and change due to an experience
dendrites
fingers
picks up on messages from cells
what is a nerve
a cluster of axons
white vs gray matter
white matter is tissue made with axons covered by myelin sheath, gray matter has no sheath
axon
arm
structure that helps transmit neural messages
myelin sheath
bumps
fatty substance, insulates (avoids interferance) and speeds up nerve
terminal buttons
sends neurotransmitter to other neurons through synapse
synapse
space between neurons
glia
glues neuron in place, keeps cell going i guess
absolute refractory period
time when neuron can’t fire regardless of stimulation
relative refractory period
can only fire when given more stimulation than normal
neural impulse or action potential
energy from neuron firing, or the act of a neuron firing
graded potential
when a signal passes from neuron to neuron; electric charge just shifts, doesn’t completely change like action potential
threshold of excitation
minimum stimulus needed for 1+ neuron to activate another neuron to continue the chain up to/away from brain
three neurons in body
sensory/afferent
motor/efferent
interneuron/associational
sensory/afferent neuron
carries info from sense organs to brain/spinal cord
motor/efferent neuron
carries info from brain/spinal cord to muscles
interneuron/associational neuron
mostly in brain, relays info between neurons
neurotransmitter
any chemical substance that helps transmit neural messages
Long-Term Potentiation
vibration from stimulus continues weeks after experience
acetylcholine
excitatory neurotransmitter;
attention, motivation, memory
dopamine
brain’s reward center; pleasure
seratonin
mood molecule; regulate sleep cycle
norepinephrine
adrenal hormone, excitatory; helps neural transmitters pass synaptic gap
2 major parts of nervous system
central (brain and spinal cord) and peripheral (everything else)
endorphins
blocks pain signals from brain
Central nervous system parts
hindbrain, midbrain, forebrain, cerebral cortex
hindbrain parts
medulla, pons, cerebellum
forebrain parts
thalamus, hypothalamus
cerebral cortex parts
occipital lobe, temporal lobe, parietal lobe, frontal lobe
hindbrain
basic survival functions
medulla
vital, kinda involuntary life functions (heart rate, breathing, blood pressure) and transmits to upper brain
pons
regulates body movement and sleep
cerebellum
balance and coordination
midbrain
reflex movements, pain signals
forebrain
aka neocortex
thinking and logic
thalamus
major sensory relay center (“post office”)
hypothalamus
motivation
cerebral cortex
made of gyri and sulci (brain folds)
occipital lobe
process visual info
temporal lobe
language comprehension
parietal lobe
spatial awareness
frontal lobe
critical thinking
peripheral system is split into -
somatic (movement and environment) and autonomic (organs and glands)
reticular formation
neurons in most of central nervous system that alerts other brain parts
parts of limbic system
hippocampus (memories) and amygdala (emotions)
primary motor cortex
voluntary movement
Left hemisphere
speech and language comprehension, math, time and order
Broca’s area
motor projection for speech (thoughts into words)
expressive aphosia
can’t put thoughts into words
Wernicke’s area
listening comprehension
receptive aphasia
can’t understand language
Right hemisphere
spatial awareness, creativity, context/perception, visual recognition
corpus callebum
fibrous tissue, bundle of nerves, connects hemispheres
pedi mal seizure
basically spacing out
grand mal seizure
convulsing
CAT scan
3D image from many xrays
MRI scan
images of inside brain
magnetic field and radio waves
EEG
electrodes, makes colored image
PET
radioactive injection to see active parts of brain
thyroid gland
produces thyroxin to regulate rate of metabolism
parathyroid gland
produce parathormone to regulate Ca and P in blood/tissue fluids
pineal gland
produce melatonin
adrenal gland
release adrenaline
pancreas
produce insulin, glucagon, digestive enzymes
pituitary gland
controls all other glands
posterior pituitary
releases hormones; vassopression and oxytocin
anterior pituitary
growth hormones