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I

Immune system
Network of cells and organs that protects the body from outside invaders.
Immunization
The process by which a normally vulnerable host can be made resistant to an infectious disease, usually by administration of a vaccine.
Inbreeding
The mating of closely related individuals.
Infarction
Tissue death as a result of ischaemia.
Infection
The process in which the body is invaded by microorganisms, which then multiply within the tissues.
Inferior vena cava
The lower branch of the vena cava, the large vein that returns deoxygenated blood from the trunk and legs to the right side of the heart.
Inflammation
Cellular and chemical reaction that occurs in body tissues in response to injury or irritation from a physical, chemical, or biologic agent.
Informed consent
A process by which a subject voluntarily confirms his or her willingness to participate in a particular trial, after having been informed of all aspects of the trial that are relevant to the subject's decision to participate. Informed consent is documented by means of a written, signed and dated informed consent form.
Inhale
Breathe in.
Inoculation
The introduction of cells into a specific environment in order to start a culture.
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