Cell transport

Cell membrane 

• seperates interior of cell from exterior

• lipid bilayer that is semipermeable

• regulates transport of material enetering and exiting cell (determined by size and polarity)

• double layer of phospholipids

phospholipids

• hydrophilic head

• hydrophobic tail

• regulates molecules entering and exiting the cell

hydrophilic head

• phosphate

• glycerol

hydrophopic tail

• fatty acids

• attracted to each other to face away from water

cell membrane

• glycolipid

• protien channel

• peripheral protien

• globular protien

• intergral protien

• cholestrol

• glycoprotien

• a-Helix protien 

• phospholipids

semipermiable membrane

• lets non-charged particles through but stops charged particles (ions)

• lets small particles through but stops large ones

Cell membrane filter

• polarity

• size

simple diffusion

small, nonpolar molecules moving from high concentration to low concentration across a membrane

selectively permeable membrane

• barrier that allows certain molecules or ions to pass through while blocking others

• consists of mainly phospholipids and protiens

• small polar and nonpolar molecules move through

facilitated diffusion

• moves molecules across a cell membrane with the help of carrier protiens

• for glucose to pass through

• hormones attach to protien 

active transport

• uses energy in the form of ATP to push, allowing substance to go through

• ATP tranformed into ADP waste (can be turned back into ATP)

• lower to higher concentration

hydrophilic

loves water

hydrophobic

hates water

phosolipid

• head: hydrophilic, phosphate, glycerol

• tail: hydrophobic, fatty acids

fluid mosaic

• fluid: molecules in membrane move around/diffuse with membrane

• mosaic: protiens scattered/randomly throughout or many different protien types