Loren bio 7
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Loren bio 7
Loren bio 7 (nervous system)
What's the functional unit of the nerve?
What's another name for the cell body?
What are the three parts of a nerve cell?
What cells are the axons made of?
Schwann cell (PNS)
What's the millivolts at resting potential?
What's more negative, the inside or outside of a nerve cell?
the inside ( more K)
How does the ATPase work? (Na/K pump)
it takes 3 Na out for every 2 K brought in
Why does Na want into the cell?
cause of concentration difference, and charge difference
When does the action potential go off?
when the resting potential gets about to -55 mV it shoots off.
Whats the rest period called?
what affects the speed of a nerve impulse?
the size of a nerve cell (bigger faster)
more myelin (faster)
What does S.A.M.E. stand for?
What's involved in the CNS
brain and spine
What's involved in the PNS (periphery)
What is the somatic nervous system?
its the voluntary skeletal muscle use
What's the autonomic nervous system?
: fight or flight
: rest and relax
What effect does the drug curare have on nerves?
it blocks post synaptic receptors (paralysis)
What effect does Botulism toxin have?
it blocks presynaptic acetycholine (paralysis)
What effect does Anti-cholinesterases have?
it blocks the "breakdown" of neurotransmitter acetylcholine (muscle goes crazy and can't stop)
What portion of the brain is gray?
what portion of the brain is white?
the inner portion
Where is the telenchephalon/diencephalon located?
in the forebrain
What is in the forebrain?
What does the cerebral cortex do?
memory and ideas
What does the thalamus do?
relays stuff to spinal cord
What does the hypo thalamus do?
hunger, thirst, sex, water balance, blood pressure, temp regulator
Whats in the midbrain?
the mesencephalon (visual, audio, motor)
What's the brainstem?
What's in the hindbrain? three things
medulla (medulla oblangata)
What does the cerebellum do?
motor skills (balance, hand eye coordination)
What does the pons do?
middle man from cortex to cerebullum
What's the medulla oblongata do?
regulates breathing, heart rate, stomach
What's the white part of the eye?
What does the choroid do?
gets blood to the retina
Where are the photoreceptors located?
in the retina
Where does the lens focus light to?
what do cones see best
color, intense light
What do rods see best?
low intensity light (night)
What are the three pigments in cones?
red, green, blue
What's the one pigment in Rods?
What is myopia? (it's
nearsighted...can see close
pressure in the eye. (aqueous humor)
What are the three ear bones (ossicles) called?
malleus, incus, stapes
Where are the three bones located?
What goes on in the inner ear?
the vestibular apparatus helps with balance
the cochlea (vibrations twitch the hair cells in the basilar membrane.
Describe protozoa NS
no organized NS ....but they respond to stimuli
Describe cnidaria NS
simple nerve net
clusters cells and pathways....help coordinate swimming
Describe annelida NS
earthworms have a primitive CNS
Describe Arthropod NS
more specialized sense organs. similar primitive like the worm