Test Flashcards
The most important property of the cell membrane is that it is
semi permeable-when some things go in and out
The model that explains the structure of the membrane is the
fluid mosaic
The main molecule that creates the framework of the membrane is the
phosopholipid
Membrane channels are made of
proteins
Phospholipids are arranged into a
bilayer
How do molecules like oxygen and carbon dioxide pass through the membrane?
simple diffusion
How do polar and charged substances pass through the membrane:
facilitated diffusion
When cells move substances from lower to higher concentration, this is known as
active transport
When cells engulf particles outside the cell to bring them inside, it’s known as
endocytosis
When cells dump wastes or other materials outside the cells, it’s known as
exocitosis
Active transport requires the cell to use
energy
Diffusion is based on the
random movement of molecules
The head of a phospholipid is
polar and hydrophilic
the tail of the phospholipid is
hydrophilic and non polar
Explain how the cell membrane maintains homeostasis of the cell.
The cell membrane helps maintain homeostasis by controlling what enters and exits the cell.
