Biopsych ch. 2 Flashcards


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1

Membrane Potential

difference of electrical charge inside and outside the cell

2

positive potential

inside of the cell is more (+) OR outside of the cell is less (-)

3

negative potential

inside of the cell is more (-) OR outside the cell is more (+)

4

What is a neuron's resting potential?

-70 mVs

5

What are the 4 gated channels?

  • Ligand-gated (chemical)
  • mechanically-gated
  • voltage-gated (electrical)
  • always open

6

What are the 2 forces that cause Ions to move?

  • Diffusion
  • Electrostatic Pressure

7

What is Diffusion?

causes ions to spread toward a uniformed concentration, along a concentration gradient

8

What is electrostatic pressure?

causes ions to flow towards oppositely charged ions

9

What are the 2 gradients?

  • electrical gradient
  • concentration gradient

10

The sodium-potassium pump moves (. ) to the outside of the cell

The sodium-potassium pump moves sodium to the outside of the cell

11

The sodium-potassium pump moves (. ) to the inside of the cell

The sodium-potassium pump moves potassium to the in side of the cell

12

During a ( ), the cell's cytoplasm is negatively charged relative to the outside of the cell.

During resting potential, the cell's cytoplasm is negatively charged relative to the outside of the cell.

13

During a ( ), the cell's cytoplasm is positively charged relative to the outside of the cell.

During an action potential, the cell's cytoplasm is positively charged relative to the outside of the cell.

14

What is an action potential?

"spike", rapid reversal of the membrane potential that momentarily makes the inside of the neuron positive with respect to the outside

15

What is hyperpolarization?

  • increase in membrane potential
  • interior of the cell becomes more negative and farther to zero

16

What is depolarization?

  • decrease in membrane potential
  • interior of the cell becomes less negative and closer to zero

17

What are Anions?

  • (-) charged ions, large anions contribute to (-) ion potential in the neuron

18

What are cations?

  • (+) charged

19

What are the refractory phases?

  • Absolute
  • Relative

20

What is absolute refractory?

  • won't fire again
  • brief period of insensitivity to stimuli

21

What is the relative refractory phase?

  • a period of reduced sensitivity during which only strong stimulation produces an action potential

22

What are the post-synaptic membrane potential

  • Excitatory postsynaptic potential (EPSP)
  • Inhibitory postsynaptic potential (IPSP)

23

What is Excitatory postsynaptic potential (EPSP)

  • depolarization potential in the postsynaptic membrane
  • pushes the cell closer to the action potential threshold
  • sodium channels are opening up
  • (+) charged

24

What is inhibitory postsynaptic potential (IPSP)

  • Hyperpolarization potential in the postsynaptic membrane
  • pushes the cell further away from the action potential threshold
  • decrease the likelihood of neuron firing an action potential
  • fluride channels open up, (-) charged