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ability to resist specific types of disease


Lack of appetite


breeding from two animals that are closely related, e.g. brother and sister

Inbreeding depression

loss of health and increasing weakness brought about by inbreeding over successive generations

Incubation period

the time between an individual animal meeting a source of infection and developing clinical signs of disease


the invasion and multiplication of micro-organisms in body tissues


capable of causing disease between animals


the body's reaction to injury and infection characterized by pain, swelling and heat


the taking in of food


a raw or processed foodstuff used in manufacturing food


a substance that is not derived from a living organism and does not contain hydrocarbon groups


drug that increases the force of cardiac contraction

Insensible losses

water losses from the body that cannot be accurately measured


the act of taking air into the body - breathing in

Inspiratory capacity

Inspiratory reserve volume

the extra volume of air taken into the lungs, above that of the normal tidal volume after a forced inspiration

Intensifying screens

structures within a radiographic cassette which fluoresce when struck by X-rays

Intercalated neuron

a neuron that lies between a sensory and a motor neuron but which in itself has neither sensory nor motor functions

Internal respiration

the exchange of gases between the blood and the tissues. Also called tissue respiration.


sensory cells that detect stimuli from within the body, for example, information pertaining to blood pressure

Interspecific hybrid

result of crossing two animals from different species

Interstitial fluid

fluid found between the cells but not within the vascular system

Intracellular fluid (ICF)

fluid found inside the cells


into a muscle


injection where drugs are administered into the cerebrospinal fluid


into a vein


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


a charged particle


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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