DEFINITIONS Flashcards
Diffusion
The net movement of particles from where they are at a higher to where they are at a lower concentration.
Osmosis
The net movement of water from a solution with a higher to lower water potential through a partially permeable membrane.
Phagocytosis
The uptake of SOLIDS by vesicle formation.
Example:
Ingestion of bacteria by white blood cells
Water Potential
The pressure exerted by water molecules as they collide with a membrane or container.
Endocytosis (Importing)
An active transportation of large materials in bulk by vesicles from OUTSIDE the cell to the INSIDE.
Exocytosis
An active transportation of large materials in bulk by vesicles from INSIDE the cell to the OUTSIDE.
Example:
Secretion of amylase from salivary glands
Pinocytosis
The uptake of FLUIDS by vesicle formation.
Example:
Lipid absorption by epithelial cells of small intestine
ATP (Adenosine triphosphate)
- Molecule used to store energy temporarily in organisms.
- Can be broken down to adenosine diphosphate + phosphate to release energy to drive metabolic processes.
Active transport
Movement of substances across membranes against their concentration gradient, requiring the use of energy in the form of ATP.
Active transport usually involves the use of transport proteins.
