7-1 (8.12.16) Flashcards Preview

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Flashcards in 7-1 (8.12.16) Deck (20):
1

most of the time a cell's membrane potential is (+/-)

negative

2

things that influence whether an ion will flow thru membrane

1) [ ] gradient
2) electrical gradient
3) permeability of membrane for ion

3

define inward current

flow of positive charge INTO cell

4

define Nernest equilibrium

voltage gradient exactly compensates the concentration gradient, so NO NET flux

5

purpose of Nernest eq

what other thing does the same thing

predict if ion will have net flux in or out of cell at a given membrane potential

net driving force (Vm - Eion)

6

define the eq components of net driving force

Vm is membrane potential
Eion is Nernst potential

7

resting membrane potential is near E_?

k
(near potassium's)

8

define reversal potential

when there's no net ionic flux thru channel

9

purpose of knowing reversal potential

predict whether opening/closing of ion channel will depolarize or hyperpolarize membrane

10

GHK eq - how it's gonna be tested

know that it calculates Vm (membrane potential)

know that you plug in permeability and [ ] gradient

eq predicts reversal potentials

11

define epithelium

cellular covering of internal and external surfaces of body,

12

features of epithelial tissue
-arranged in what
-rests on what
-derived from what
-vascular or avascular

-arranged in sheets
-rests on basal lamina
-derived from all three germ layers
-avascular

13

cells exhibit "" (polarity)

what does this mean

sidedness

all surfaces are NOT equal

14

dif bt apical and lateral and basal surface

apical interacts with lumen (read: refers to TOP, like apex)

lateral HAS intercellular junctions (read: refers to internal stuff)

basal interacts with underlying connective tissue (refers to bottom)

15

stereo cilia is most closely related to what

micro villi

16

what composes the basement membrane

basal lamina
reticular lamina

17

basal infoldings are typical in areas requiring () transport

active

18

necessary fact about pseudostratified columnar

all contact basal lamina but not all reach luminal surface

19

dif bt exocrine and endocrine

exo = duct on surface and secrete apically

endo = no ducts and secrete hormone basally

20

name the two types of exocrine glands

goblet
tubular