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Flashcards in Membrane Transport Mechanisms Deck (22):
1

Define kinetic energy

energy that the body possesses as a result of motion (energy of motion)

2

define thermal energy

internal energy of an object that results from the kinetic energy of its atoms/molecule (kinetic energy of moving molecules)

3

Which transport mechanism requires energy other than kinetic energy

active transport

4

what do active transport and facilitated diffusion have in common?

the both use a carrier

5

what ion is most concentrated in the extracellular environment

sodium

6

The sodium potassium pump is an example of which of the following types of transport

primary active transport

7

the sodium glucose pump is an example of which of the following kinds of transport

secondary active transport

8

the sodium calcium pump is an example of which of the following kinds of transport

secondary active transport

9

glucose transporters employ which of the following kinds of transport

facilitated diffusion

10

define diffusion

random movement of molecules from high concentration to low concentration

11

define osmosis

movement of a solvent from a region of high concentration to a region of low concentration across a semipermeable membrane (semipermeable membrane is needed)

12

what does osmotic pressure depend on

the concentration of osmotically active particles (van't Hoff's law)

13

what types of transport are energy independent

diffusion
osmosis
facilitated diffusion

14

what is the difference between primary and secondary active transport

primary requires ATPases and secondary requires multiporters

15

what are ATPases

enzymes that split the phosphate of ATP and transfer it to another molecule (basically transferring energy) and effect transfer across the membrane (directly requires ATP)

16

what factors effect diffusion

proportional to concentration difference across membrane
membrane electric potential
pressure difference

17

what are some factors that increase permeability in diffusion

increased oil/water coefficient
decreased size of soluble
decreased membrane thickness

18

what is the function of the selectivity filter and how does it work

the selectivity filter is used in order to give preference to certain ions over others. it forms the most constricted part of the conduction pathway. it is a constriction of the channel ringed by negatively charged carbonyl oxygens

19

which type of neuron transmits an action potential the fastest

large diameter, myelinated

20

saltatory conduction is characteristic of what part of a typical neuron

axon

21

a selectivity filter with carbonyl oxygens is associated with which of the following kinds of ion channels

potassium

22

the resting potential for a typical neuron (such as a motor neuron) is best represented by what potential?

-90mV