Exam 1 part 3 Flashcards
What polarity of molecule can pass through the plasma membrane
Non-polar
As O2 diffuses into the plasma membrane ___ diffuses out
CO2
Diffusion moves from a ___ concentration to a ____ concentration until _____ is reached
higher
lower
equiliberium
A higher magnitude of concentration gradient will speed/slow diffusion, a higher surface area will speed/slow diffusion, a higher temperature will speed/slow diffusion
speed
speed
speed
Permeability of the membrane is determined by
what polarity it is made out of
Protein gated channels work by:
and will let polar/nonplar molecules in through _____
being triggered and opened, the protein will change shape and let molecules in through diffusion, though has small area of permeability, since gate.
polar
diffusion
Proteins can/cannot be amphipathic which makes them good gates
can
Net diffusion of water down its concentration gradient is determined by ______ differences.
osmolarity
A 300 osmolarity cell placed in a 400 solution would shrink/burst/be fine because the solution is _______
shrink
hypertonic
A 300 osmolarity cell placed in a 200 solution would shrink/burst/be fine because the solution is _______
burst
hypotonic
a 300 osmolarity cell placed in a 300 solution would shrink/burst/be fine because the solution is _______
be fine
isotonic
The maximum rate of carrier-mediated transport is determined by
saturation
rate of diffusion is technically limited/infinate as opposed to carrier mediated which is limited/infinite in rate
infinite
limited
How would a competitor ion effect the rate of carrier mediated transport?
it would reduce the maximum rate by 50%
T/F for facilitated diffusion
- Substances move from lower concentration to higher
- Requires carrier molecule
- energy is required
- it is different from diffusion because transporter proteins can become saturated
F
T
F
T
Glucose is let into the cell through _____ _____ using ____
facilitated diffusion
glut
Active transport T/F
- Moves a substance towards its concentration gradient
- Requires a carrier molecule
- Requires energy
F
T
T
Describe the main difference between primary active transport versus Secondary active transport
Primary energy source is ATP whereas secondary utilizes an Ion concentration gradient (coupled transport) which is often Na+
Describe the Na+ K+ pump and it’s purpose
3 Na+ are pumped out while 2 K+ are pumped in, this reduces the positive charge of the cell and creates potential energy which lead to nerve impules
Paracellular transport means whereas transcellular transport
transport of molecules between nearby cells, in the interstitial fluid surrounding the cell
is transport of molecules through the actual cell.
Tight junctions allow/do not allow easy diffusion
do not
Adherens are
junctions created by two cells being latched to eachother for stability, utilizes action filiments
Desmosomes are
junctions that connect cells using intermediate filiments.
What type of junction ?
- Localized patches that hold two cells together
- are common in skin
- and give strength
Desmosomes
