cell transport plants+human cells Flashcards
difference between a vascular and non vascular plant system?
vascular system has plant vessels e.g xylem and pholem for water and glucose transport while non vascular does not
how does non vascular plant systems get water then?
through osmosis, type of cell transport
what does the cell membrane control?
what goes in and out, controls homeostasis
how many layers are in the cell membrane and what are they called?
two layers called the phospholipid bilayer, made from lipid fats
what kind of cells can easily transfer through the cell membrane?
polar cells e.g oxygen and co2
what does facilitated diffusion do?
help cells that are too large to pass through the cell membrane with transport proteins
passive transport (no energy required)
what energy supplies active transport?
atp energy (adenosine triphosphate) three phosphates when one is broken off it relases atp energy
why does active transport require energy?
goes against the gradient, from high to low
the purpose of endocytosis and exocytosis?
a form of active transport that moves cells that are too big across the cell membrane
describe endocytosis
moves cells INTO the membrane, firstly is invagination the cell membrane begins to envelope the cell, once inside the membrane it is called a ‘vesticle’,
relation of endocytosis and phagocytosis
phagocytosis when bacteria is engulfed into the cell the vesticle is now called a phagosome
explain pinocytosis
this is when liquids and soluble molecules are absorbed by the cell membrane and taken into the cell by a vesicle. it usually happens when it has reacted to a molecule activating the cell membranes receptor’s, it will take in many different kind of molecules e.g sugars and proteins (not like receptor mediated endocytosis bc it is not picky about what cells it will invaginate)
why does the cell need exocytosis?
this gets products out of the cell, e.g polysaccharides of carbohydrates are needed to get out of a plant cell so it can repair the cell’s cell wall.
