Addiction and neural ageing
Addiction and neural ageing

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Glossary for SD805_2
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Federal Drugs Administration. The US drugs policy and control organisation.


The number of fertilised eggs that a sexually reproducing organism produces.


A process whereby action is taken in anticipation of what might happen in the future. It is usually contrasted with negative feedback in which action depends upon error signals.


A sustained increase in body temperature above normal. It is usually the result of infection but can be due to physical trauma.


Type of differentiated cell in the dermis (and elsewhere in the body) that produces collagen and other proteins of the extracellular matrix. Fibroblasts are connective tissue cells.

filial piety

The dutifulness that a son or daughter displays to his or her parents.


Ability of an organism to survive and produce offspring that can themselves produce viable offspring. The term should not be confused with the common use, which refers specifically to physical bodily fitness.

flavin adenine dinucleotide (FAD)

A hydrogencarrying coenzyme derived from vitamin B2 (riboflavin).

free radicals

Atoms or group of atoms that contain unpaired electrons and are therefore unstable and highly reactive. They are produced both via metabolism and by exposure to harmful substances. Free radicals acquire electrons from other molecules around them, thus creating another unpaired electron in that molecule, and so on, resulting in a chain reaction. This chain reaction can cause considerable damage to living material. Free radicals can be inactivated by antioxidants.

functional explanation

An explanation given in terms of how something appeared in evolution. It explains how something contributed to evolutionary success in evolutionary history. It should be distinguished from a causal explanation.

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