Glossary

An A-Z of keywords and phrases, all of which are relevant to the post-16 biology curriculum.

 

A B C D E F G H I J K L M N O P Q R S T U V W Y Z
White blood cells (also leucocytes or leukocytes)

Made in the bone marrow, these cells are an important part of the immune system. There are two main types: granulocytes, which have granular cytoplasm and a lobed nucleus, and agranulocytes, which have smooth cytoplasm and a non-lobed nucleus.

White fat

A type of adipose (fat) tissue, also known as white adipose tissue (WAT). White fat serves three functions: heat insulation, mechanical cushioning and, most importantly, a source of energy.

Withdrawal

The symptoms that occur after an individual who has a physical or psychological dependence on a medical or recreational drug stops taking it. Symptoms can included anxiety, sweating, nausea, insomnia and fatigue.