Cell Transport Flashcards
MWCO what does it stand for and what does it determine?
Molecular weight cutoff. It determines the pore size. The higher the MWCO the larger the pore size
Do bigger pores mean faster diffusion? why or why not?
If solutes are able to travel back and forth then no because there can be an equal rate for and reverse
If solutes are only able to travel one way like a filter then bigger pores does mean a faster diffusion
What factors make a molecule in need of a protein channel?
What is this type of transport called?
Molecules are sometimes too large or are hydrophilic so they cant cross the membrane without the help of a Chanel.
This is called facilitated diffusion
What factors affect the diffusion rate and which one affects the rate the most?
The permeability so # of transporters and initial concentration gradient affects the diffusion rate.
The # of transporters affects the rate the most. This is the rate limiting step bc if transporters can be saturated.
Why doesn’t NaCl affect glucose diffusion rate?
Glucose has its own specific transport that NaCl cannot use. NaCL is not a competitive inhibitor of that channel
What is osmosis?
diffusion of water to balance the concentration of solutes
What is osmotic pressure and what creates it?
Osmotic pressure is created by the solutes that are not able to pass the membrane.
High osmotic pressure= high solute concentration that is not able to pass membrane
Which direction does H2o diffuse according to osmosis pressures
H20 travels from low osmosis pressure to high osmosis pressure
What happens when you put a cell in a hypertonic solution?
The cell will shrink bc water will diffuse out.
What happens when you put a cell in a hypotonic solution?
The cell will swell bc water will diffuse in
Give examples of where filtration occurs
Capillary beds and glomerulus of nephron
What is the purpose of residual analysis
It detects the specific solutes stuck on filter using mass/ratio charge
What does filtration rate depend on?
It depends on the pore size and hydrostatic pressure.
An increase in both leads to an increase of filtration rate
Does an increase in rate also mean that the final concentration of the filtrate increases?
No because the final concentration depends on the initial concentration so rate does not affect this
