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I

Interstitial fluid

fluid found between the cells but not within the vascular system


Intracellular fluid (ICF)

fluid found inside the cells


Intramuscular

into a muscle


Intrathecal

injection where drugs are administered into the cerebrospinal fluid


Intravenous

into a vein


Intussusception

telescoping of part of the intestine into itself causing an obstruction


Inverse square law

the intensity of the radiation beam is inversely proportional to the square of the distance from the source i.e. X-rays diverge increasingly, the further they travel from the tube head, and their intensity falls


Ion

a charged particle


Isotonic

a fluid with the same osmotic pressure as that with which it is compared (usually plasma)


Isotonic fluid

has the same concentration of solutes as blood plasma; water neither enters nor leaves the cells and remains in equilibrium 



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