Addiction and neural ageing
Addiction and neural ageing

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.


Glossary for SD805_2
Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL

Page: (Previous)   1  2  3  4  (Next)



A cell that serves to communicate and process information within the nervous system.


A small molecule synthesised and released by the nerve endings of nerve cells in the process of transmission of nerve impulses.

neutral stimulus

A stimulus that has no obvious effect in terms of evoking a response. A conditional stimulus prior to conditioning.


Particle with no electric charge which is present in atomic nuclei.

nicotinamide adenine dinucleotide (NAD+)

Hydrogencarrying coenzyme derived from the vitamin niacin.

N-methyl-D-aspartate (NMDA) receptor

One subtype of glutamate receptor, which binds the amino acid glutamate (a major excitatory neurotransmitter) and mediates its effect in neurotransmission. It is named after the dicarboxylic amino acid N-methyl-D-aspartate (NMDA), an agonist of glutamate used extensively to characterise different isoforms of glutamate receptor.


A neuron that is sensitive to tissue damage at its tip. Normally, the first stage in the process of pain.

non-insulin-dependent diabetes mellitus (NIDDM)

The most common form of diabetes mellitus, in which the responsiveness of cells to insulin is diminished. Thus, although insulin may be present at normal (or near-normal) levels, it is not able to effect its normal regulatory role.

See also diabetes mellitus (type II).

non-manual social classes

Those who fall into this social class are from professional and managerial occupations; sometimes called white-collar workers.

non-shivering thermogenesis

Generation of heat in brown adipose tissue (BAT) by the uncoupling of ATP formation from the electron transport chain. This is an important mechanism for the maintenance of body temperature in newborn babies.

Page: (Previous)   1  2  3  4  (Next)

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371