Movement of Substance within the
Body.
There are many exauples in the
body of substain moving up hill ie. Against the concentration gradieut in this
care chemical energy is required, unusually in the from of ATP.
Diffusion:- it refers to the
movement of a chemical substance from an area of lower concentration and occurs
mainly in gases,liquids and solutions.
DIFFUSION
1.This process enables the transfer of oxygen from the
alveoli of the lungs (high concentration) through the alveolar and capillary
walls into the blood (low concentration).
2. diffusion can also occur across a semipermeable membrane
such as the plasma membrane.
OSMOSIS :
Osmosis is the movement of water down its concentration
gradient across a semipermeable membrane when equilibrium cannot be achieved by
diffusion of solute molecules.
1.its usually because the solute molecules are too large to
pass through the pores in the membrane the force which called it has OSMOTIC
PRESSURE.
EXTRACELLULAR FLUID (ECF):
It consists of blood ,plasma,lymph,CSF and fluid in the
interstitial spaces of the body.
INTRACELLULAR FLUID (ICF):
The composition of intracellular fluid (ICF) is largely
controlled by the cell itself,because there are selective uptake and discharge
mechanism present in the membrane.
Composition of ICF:
Sodium levels are nearly ten times higher in the ECF.
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