Lesson 5: Endocytosis & SA:V Ratio Flashcards
Bulk transport is the movement of…
large molecules across a membrane.
Bulk transport is an…
active process and requires ATP.
Endocytosis is a…
transport mechanism that allows materials from the cells’ exterior side to enter the cell.
Endocytosis is used for…
large molecules, cell components, hormones, and impulses.
When the target particle reaches the plasma membrane, it forms a pinching pocket around it…
enclosing it in a newly generated intracellular vesicle, composed of a plasma membrane.
Phagocytosis is a type of…
endocytosis, which transports solid particles into a cell inside a vesicle.
Pinocytosis
cell drinking’ - the cell takes in small amounts of extracellular fluid.
Exocytosis is the movement of substances…
out of the cell from cytoplasm to extracellular fluid.
A transport vesicle in exocytosis may contain…
waste or substances needed for secretion, e.g. digestive enzymes.
In exocytosis, the transport vesicle fuses with…
the cell membrane, breaking down the junction and releasing the materials.
Cells must exchange…
nutrients and waste with their environment.
Surface area of a cell membrane affects…
the rate of exchange.
A small cell =
maximum exchange efficiency (large SA:V ratio)
Cells with a large surface area compared to their volume are able to…
move nutrients in and waste out of their cell membranes more effectively to ensure their survival.
Being small =
more efficient exchange.
