Physiology Exam 1 Lecture 1

Front 1

what numerical value is the resting membrane potential

Back 1

-70 mV

Front 2

electric potentials occue via what two mechanisms?

Back 2

graded potential
action potentials

Front 3

graded or action. which potential is important for signaling over short distances

Back 3

graded

Front 4

graded or action. which potential is important for long distance signaling along nerve and muscle fibers

Back 4

action

Front 5

definition. membrane potential becomes less negative (close to zero) than the resting potential

Back 5

depolarization

Front 6

defintion. a reversal in the membrane potential where the inside of the clel beocmes positive relative to the outside

Back 6

overshoot

Front 7

definition. return to resting (polarized) potential

Back 7

repolarization

Front 8

deifnition. when the membrane potential is more negative than the resting potential

Back 8

hyperpolarizastion

Front 9

in hyperpolarization is the equilibrium potential closest to resting K or Na

Back 9

K goes back to negative but hyper shoots it

Front 10

definition. when the membrane potential lis depolarized =

Back 10

0

Front 11

an important term that describes resting membrane potential

Back 11

polarized

Front 12

definition. the voltage difference between two points

Back 12

potential or potential differnece

Front 13

definition the voltage difference between the inside and outside of a cell

Back 13

membrane potential

Front 14

definnition. the voltage difference across a membrane that produces a flux of a given ion species that is equal but opposite to the flux due to the conc gradient of that same ion species

Back 14

equil potential

Front 15

definition. he steady transmembrane potential of a cell tha tis not producig an electrical signal

Back 15

resting membrane potential

Front 16

definition. a potential change of variable amplitude and duration that is onducted decremetally; it has no threshold or refractory period

Back 16

graded potential

Front 17

does a graded potential have a threshold?

Back 17

no

Front 18

does a graded potential have a refractory?

Back 18

no it does not even have a threshodl

Front 19

definitoin. a brief all or none depoliarization of the membrane reversing polarity in nuerons; it has a threshold and refractory period and it cnoducted wiout decrement

Back 19

action potential

Front 20

is an action potential conducted with decrement?

Back 20

NO

Front 21

what are three kinds of graded potential

Back 21

synpatic potential
receptor
pacemaker

Front 22

whcih graded potential is prouced at the peripheral endings of afferent neurons i response to a stimulus

Back 22

receptor

Front 23

which graded potential is produced in the postsynaptic neuron in response to the release of a neurotrans by presynatic terminal

Back 23

synaptic potential

Front 24

which potential is a spontaneously occurring graded potential change that occurs in certain speciazed cells

Back 24

pacemaker potential

Front 25

definition. the membrane potential at which an actino potential is initiated

Back 25

threshold potential

Front 26

do changes in the membrane take place over a large or small region of the plasma membrane

Back 26

small confined region

Front 27

what are the three types of graded potentials

Back 27

synaptic
receptor
pacemaer

Front 28

what does decremental mean?

Back 28

dies with distance

Front 29

what does decremental describe

Back 29

graded membrane potentials

Front 30

does hyperpolarizing promote or inhibit action potentials

Back 30

inhibit

Front 31

why is it that graded potentials are decremental?

Back 31

leaky K

Front 32

in graded membrane potentials does higher magnitude equal higher intensity

Back 32

yes

Front 33

true or false. graded potentials can be depolarizing hyperpolarizing can vary in size and are decremental

Back 33

true

Front 34

true or false. action potentials are produced by nerve and msucle cells as well as some endocrine immuneand reproductive cells

Back 34

true

Front 35

are action potentials confined to nerve cells only

Back 35

NO

Front 36

definition. the ability to generate action potentials

Back 36

excitability

Front 37

true or false. action potentials are used for short distance

Back 37

false. long distance

Front 38

true or false. action potentials are dependent on voltage gated ions

Back 38

true

Front 39

are K ion channels fast or slow

Back 39

slow

Front 40

why is it important that Na have the ball and chain gate

Back 40

because the channel opens at a certain voltage but there is no "close" voltage

Front 41

is depolarization positive or negative feedback

Back 41

POSITIVE

Front 42

lecture page 6

Back 42

page 6