neurons

Question 1

resting potential

Answer 1

neurons are internally negative and the environment is positive

Question 2

threshold

Answer 2

the amount of electricity that must be surpassed for action potential to occur

-40mV

Question 3

action potential

Answer 3

ion channels in neuron membrane let ions in/out

Question 4

Na+ and K+

Answer 4

sodium is more positive, so mainly starts outside of neuron

negative charge in axon from already existing ions

Question 5

electrostatic pressure

Answer 5

drives ions of opposite charges tgt / similar ones away

Na+ attracted to negative charge in neuron and hover around ion channels for entry

Question 6

sodium-potassium pumps

Answer 6

push out sodium and let K in

Question 7

absolute refractory period

Answer 7

time after neuron fires, and it must wait until it can fire again

Question 8

relative refractory period

Answer 8

neuron can fire when threshold is met

Question 9

nodes of ranvier

Answer 9

axon not wrapped in myelin is depolarized

action potential rapidly moves down axon from node to node

Question 10

postsynaptic potenial

Answer 10

occurs when neurotransmitter attaches to receptor and ions flow into neuron

Question 11

excitatory postsynaptic potential

Answer 11

tells signal to fire again by depolarizing/makes inside LESS negative than outside

Question 12

inhibitory postsynaptic potential

Answer 12

discourages signal from firing by hyperpolarizing/makes inside MORE negative than outside

Question 13

traumatic injury

Answer 13

blow to CNS, brain impact or spinal cord damage

Question 14

acquired injury

Answer 14

toxins, infections, tumours, disease

Question 15

corpus callum

Answer 15

connects two halves of brains

if cut, separates signals

left side controls VERBAL (right side can see)
right side controls NON-VERBAL (left side can touch)