cell physiology and resting membrane potential

Question 1

plasma membrane functions

Answer 1

-detect chemical messengers
- anchor cells to the extracellular matrix
-isolate intracellular and extracellular compartments
- membrane junctions

Question 2

fluid mosaic model

Answer 2

polar head
hydrophobic tail
bilayer

Question 3

anchoring junctions

Answer 3

intracellular and extracellular protein network to help attached cells together. Strong
In skin, heat and muscle

Question 4

Tight junctions

Answer 4

when the membrane fuses together leading to a barrier In GI tract

Question 5

Gap junctions

Answer 5

2 protein channels make contact in the cytosol small ion.A.A. can get through

Question 6

Electrical attraction

Answer 6

opposite charges attract
alike oppose

Question 7

Electrical potential

Answer 7

Separate charged particles when coming together they WORK

Question 8

OHM’s law

Answer 8

V=IR

Question 9

*Resting Membrane Potential

Answer 9

Em=voltage across mem, when net current = 0
Only excitable cells use change in Em
between (-5->-10mV) inside always neg

Question 10

neurons Em

Answer 10

~70mV

Question 11

Establishing an Em

Answer 11

1. Concentration diferences
   2.Forces dictate ion movement(thinks ohms law)
2. ion permeability

Question 12

ion concentrations inside vs outside

Answer 12

Potassium (K) is larger on the inside.
Na+, Cl-, and Ca2+ are larger on the outside.