Cell Transport and Homeostasis Flashcards
Active Transport
Movement of substances across a plasma membrane that requires energy.
Diffusion
Type of Passive Transport that does not require the help of transport proteins.
Endocytosis
Type of vesicle (organelle that stores/transports materials inside a cell) transport that moves substances into a cell
Exocytosis
Type of vesicle transport that moves substances out of a cell
Facilitated Diffusion
Diffusion w/ the help of transport proteins
Note: This kind of diffusion still does NOT need energy.
Osmosis
Diffusion of water molecules across a membrane
Note: “membrane” here does not specify a cell membrane, so osmosis means any membrane barrier (e.g., water purification).
Passive Transport
Movement of substances across a plasma membrane that does not require energy.
Sodium-Potassium Pump
Type of active transport in which sodium ions are pumped out of the cell and potassium ions are pumped into the cell w/ the help of a carrier protein and energy from ATP (adenosine triphosphate).
Transport Protein
Protein in a plasma membrane that helps other substances cross the membrane.
Vesicle Transport
Type of active transport in which substances are carried across the cell membrane by vesicles.
Fick’s law
Surface area times Concentration gradient divided by Diffusion Distance
What is cell transport?
The transport of molecules into and out of a cell.
Describe the Phospholipid Bilayer.
This is what makes up the cell membrane. It has two layers of lipids that have polar heads and non-polar tails. Small, non-polar molecules, such as oxygen or carbon dioxide, have no problem getting through this (passive transport).
