Cell membrane

Cell membrane (plasma membrane)

a double layered structure that surrounds the cell. Regulates or control what enter and leave the cell and also help maintain its shape

semi permeable

allows particular substances to pass through and others cannot, aids in maintaining homeostasis

facilitated diffusion

at a certain time glucose is in high concentration outside of a cell and needs to travel through the membrane into the cell.

active transport

cell lining the gut need to take in glucose but at a certain time the concentration of extracellular glucose is lower than the concentration already stored in the cells.

simple diffusion

charged ions are traveling through a cell membrane with the concentration gradient

fluid mosaic model

double lipid layer large floating protein molecules. Water and carbon dioxide can easily pass through the membrane

active transport

endocytosis exocytosis

facilitated diffusion

for water to travel across the cell membrane at a substantial rate the water molecules travel through protein channels known as aquaporins

exocytosis

gets rid of wastes moves valuable material out of synthesize

active transport

is when cellular energy is used to move particles through a membrane

simple diffusion

molecules move from high to low concentration

equilibrium

no further net change in concentration

endocytosis

pinocytosis and phagocytosis

concentration gradient

the difference in concentration between 2 areas

osmosis

the diffusion of water through a membrane

passive transport

the passage of materials through the cell membrane without the use of energy

simple diffusion

while water molecules are polar they are also very small. One fact not mentioned in the video is that some water molecules are able to squeeze directly through the phospholipid bilayer due to their small size