ACTIVE AND PASSIVE
TRANSPORT(Diffusion)
IN A CELL MEMBRANE
The cell membrane is one of the great multi-taskers of biology. It provides structure of the cell, protects cytosolic
content of the environment and allow cells to act as specialized unit. A membrane is a cell interface with the rest
of the world – its gatekeeper. This phospholipid bilayer determines what molecules can move into and out of the
cell.
MOVEMENT ACROSS A MEMBRANE
There are two major ways that molecules can be moved across a membrane
Passive mechanism like diffusion use no energy while active transport requires energy to
get them.
The main purpose of the both transport system is to transport molecules and ions
across the cellular membrane.
Active and passive transport are the two key biological processes that play a vital role
in supplying nutrients, water, oxygen and other molecules to cells and also by
eliminating waste products.
Both active and passive transport works for a similar
cause, but with a different action.
1. PASSIVE MECHANISM:• movements of materials in and
out of the cell requires no
energy to happen.
2. ACTIVE MECHANISM:• Sometimes the body need to
move against their gradient.
This is known as uphill and
requires energy from the cell
ACTIVE TRANSPORT :It is required for the
gathering of molecules like amino acids,glucose and
ions inside the cell in high concentration.
Passive Transport:It involves simple diffusion and
osmosis
We must have heard the term “diffusion” which is the transportation of solute molecules or solute across a
permeable memberane .
Importance of active and passive transport:
Passive transport:It maintains balance in the cell, waste like carbon
dioxide ,water,etc. are diffused out and excreted.
Active transport: