Addiction and neural ageing
Addiction and neural ageing

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Glossary for SD805_2
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To do with the internal organs of the body, e.g. heart, gut.


A population of similar organisms, which usually interbreed in their natural habitat and produce fertile offspring.

spinal reflex

A reflex involving sensory neurons and motor neurons organised at a particular level within the spinal cord.

spinal system

A system involving the spinal cord, the collection of nervous system pathways and processes located within the backbone.


An array of cytoskeletal protein fibres present in a dividing cell, which joins the chromosomes, present at the cell equator, to the poles and is involved in chromosome separation during meiosis and mitosis.

split-brain individual

An individual in whom the corpus callosum has been cut. Under certain conditions, such individuals behave as if they had two brains with separate consciousnesses.

S–R psychology


Unusual repetitive behaviour such as picking a part of the skin repeatedly.


Class of lipids characterised by their four fused-ring structure. The steroid cholesterol is a component of cell membranes, conferring rigidity; some other steroids function as hormones.


Something that impinges upon an animal's sense organs.

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