Test 1-2 Flashcards
(61 cards)
When neurons are resting, what is the correct distribution of ions inside and outside of its membrane
More potassium ions and PROTEIN molecules inside, sodium and chloride ions outside
If potassium channels are blocked closed, the influence on membrane potentials will be
Less hyperpolarization
If the sodium channels are blocked closed, the influence in the membrane potentials will be
Lack of depolarization
Which organelle is responsible for the assembling of proteins
Ribosomes
During its resting state, the neuron is ___compared to the outside
Negative (-70 mV)
The sodium potassium pump forces sodium ions _____the cell and potassium ions ____the cell
Out of
Into
What is a neurons threshold potential
-55mv
According to Descartes, the site at which the mind and body interacted in the brain was the
Pineal gland
fMRI direct or interest measure of neural activity
Indirect
what is the name of two types of glial cells which make up the myelin sheath
oligodendrocytes
schwann
what is spatial summation and how does it help us compute or process information
spatial summation is when multiple inputs are added together and decide to fire a single output. it helps us sense our environment since there are multiple sensory stimuli going on around us at all times
what is ohms law, what are the different variables it represents
V=IR
voltage=current x resistance
stages of action potential
1-neuron is at “resting” membrane potential. Na/K pumps are on, making the inside of the neuron negative.
2-rising phase- characterized by rapid depolarization of the membrane. a stimulus crosses the neurons threshold, and depolarization occurs. Na+ floods into the cell and it becomes more positive
3-falling phase- K gates open in responce to depolarization and K+ starts to leave the cell. this starts to decrease cells charge back to negative.
4-undershoot-since potassium gates are open for a long time and K keeps leaving vell, it becomes more negative than resting potential. this is the refractory period.
5-since K pumps are leaky, K+ makes itsway back into the cell again to put it back at resting potential. Na+/K+pumps are on maintaining the negative charge of the neuron. Once the neuron is back to resting potential, it is abe to fire again
function of soma
body of cell. becomes positive during action potential. contains cytoplasm
termanal button function
transmitts synapses to outer post synaptic neurons. turns signal from electrical to chemical
cytoplasm
holds things in place in cell body
axon
sends signals to other neurons. it does this by sending an electrical signal down to termanal buttons, which then send chemical signals to other neurons
nucleus
where DNA is stored. this is also where RNA forms
axon collateral
branch of axon so it communicates to more neurons
nodes of ranvier.
doesnt have myelin. actually speeds up signal traveling speed.
what drug delivery has the highest chance of meningitis
epidural injection
what drug delivery technique is the leaast effective per gram of psychoactive drug
oral pill every 4 hours
a drug that helps/enhances the action of neurotransmitter is called an
agonist
a drug that blocks/suppresses the action of a neurotransmitter is called an
antagonist
