PSL 310 Cell physiology slide deck

PSL 310 exam 1

what is a composite cell

a spherical cell that represents all organelles a cell CAN have

what makes up the cells plasma membrane

98% lipid(bilayer) and 2% protein

where does the e face of a cell membrane face

out of the cell into interstitial fluid

where does the p face of a cell membrane face

faces the cytosol of the cell to the cytoplasm/ICF

how much of the membrane is lipid

98%

of the lipid how much is phospholipid in the membrane

75% of the lipid

of the lipid how much is cholesterol in the membrane

20% of the lipid

of the lipid in the membrane how much is glycolipid

5% of the lipid

phospholipids function

building block of the membrane

cholesterol function

membrane integrity

glycolipid function

identity markers, protection in the membrane

glycerophospholipid components

fatty acid, glycerol, phosphate group, polar group

glyceroglycolipid components

fatty acid, glycerol, carbohydrate

glycolipids and glycoproteins combine to make

membrane carbohydrates

what face of the cell are membrane carbohydrates located on

e face

membrane carbohydrates can act as identity markers due to being

displayed as antigens

what type of permeable is plasma membrane

selective

what does membrane transport require

a pathway and an energy source

how can membrane transport be passive

uses energy from a concentration gradient

how can membrane transport be active

using cellular energy like ATP

passive transport example simple diffusion

move small non polar molecules down their concentration gradient across a semipermeable membrane

facilitated diffusion

movement of ions and polar molecules across the cell membrane by membrane proteins with their concentration gradient

what is facilitated diffusion facilitated by

channel and carrier proteins

leak ion channel

ions can leak out across the membrane with a gradient

gated ion channel

requires a signaling molecule/ neurotransmitter binds to the receptor in order for the channel to become open

common ions to cross membrane

K+, Na+

classes of carrier proteins

uniport, support, and anti port

uniport carrier

one moleculel can cross the membrane rate with a concentration gradient

symport and anti port carriers are both

cotransport carriers

symport carrier

allows two molecules to cross the membrane int he same direction via carrier mediation ( a carrier protein helps molecules cross)

antiport carrier

passively transports two molecules in different directions across the membrane, using concentration gradients and not energy

voltage gates K+ channel