Active & co-transport Flashcards
what is active transport?
the use of energy to move substances across a partially permeable membrane from a low to high concentration ( across a concentration gradient)
how is the energy required supplied?
through the hydrolysis of ATP
what is hydrolysis?
a reaction that breaks down a large biological molecules.
what is atp?
an energy carrying molecule found in cells of a living molecule. which allows ions to be moved against a concentration gradient.
what does active transport require?
carrier proteins
what happens when there is more carrier proteins in a membrane?
the greater the availability of ATP, the greater the rate of active transport
what is the absorption of glucose?
is a multi-step process that takes place in the ephithelial cells of the ileum
how are sodium ions actively transported?
out of the ephithelial cells of the ileum, into the blood.
how does sodium (Na+ ) diffuse ?
from lumen of ileum, into the ephithelial cells through a co - transport protein. as they diffuse they carry glucose
how does sodium (Na+ ) diffuse ?
from lumen of ileum, into the ephithelial cells through a co - transport protein. as they diffuse they carry glucose
Then how does the glucose diffuse?
fro the ephithelial cells into the blood, by facilitated diffusion, through a protein channel.
compare active transport and facilitated diffusion?
active transport requires energy, facilitated diffusion doesnt. active transport requires carrier proteins whilst facilitated diffusion can use both carrier proteins and protein channels. active transport is the movement the against the concetratrion gradient whereas facilitated diffusion is the movement down the concentration gradient
what is co-transport?
movement of a small ion associated with the passage of a large molecule across a membrane using co-transport membranes.
what is the process for co transport?
- active transport. 2. co-transport. 3. facilitated diffusion.
