Cell Physiology - Transport Mechanisms

Question 1

selective permeability

Answer 1

plasma membrane allows some materials to pass while excluding others

Question 2

Solution Concentration: hypotonic

Answer 2

lysed (big & less concentration)

Question 3

Solution Concentration: normal

Answer 3

ideal (equal concentration)

Question 4

Solution Concentrations: hypertonic

Answer 4

shriveled (too concentrated)

Question 5

___ decides what goes in and out of the cell & is attracted to solute

Answer 5

water

Question 6

passive transport

Answer 6

diffusion - particles distribute evenly
- no energy required
- movement of substance from hypertonic -> hypotonic

Question 7

simple diffusion (PT)

Answer 7

unassisted movement across membrane
- CAN pass through membrane

Question 8

osmosis (PT)

Answer 8

water movement
- more water -> less water
- trying to dilute solutes

Question 9

facilitated diffusion (PT)

Answer 9

required a protein carrier/channel and lipid insoluble & large substances

Question 10

filtration (PT)

Answer 10

solute-containing fluid pushes high to low pressure
- hydrostatic pressure -> pressure gradient

Question 11

active transport

Answer 11

substances are UNABLE to pass by diffusion
- molecules are too large & hydrophilic
- less -> more
ex) trying to put 12 people in 4 passenger car

Question 12

solute pump (AT)

Answer 12

“NA+ - K+ Pump”
- pumps sodium out of cell, then potassium in the cell
- works like a sump pump

Question 13

vesicular transport (AT) - exocytosis

Answer 13

materials move out of cell
- molecules fuse w/ cell membrane
ex) hormone excretion

Question 14

vesicular transport (AT) endocytosis

Answer 14

cell absorbs material & engulfs it