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acalculia

Overview page. Subjects: Psychology — Medicine and Health.

n. an acquired inability to make simple mathematical calculations. It is a symptom of disease in the dominant parietal lobe of the brain. See Gerstmann’s syndrome.

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acceleration

Overview page. Subjects: Mathematics — Sports and Exercise Medicine.

The rate of change in velocity or the change in velocity occurring over a given time interval: acceleration = change of velocity/time. It is usually expressed as metres per second squared...

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acceleration of free fall

Overview page. Subjects: Science and Mathematics — Sports and Exercise Medicine.

(g)

The acceleration experienced by an object falling freely in a gravitational field, also known as the acceleration due to gravity. Its mean value at the Earth's surface is 9.807...

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accelerator

Overview page. Subjects: Chemistry — Dentistry.

A substance that speeds up a chemical reaction, such as the addition of plaster of Paris to mineral trioxide aggregate. Heat may also act as an accelerator in speeding up the setting...

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accessory cell

Overview page. Subjects: Science and Mathematics — Medicine and Health.

Any of a number of cells in the nervous system that contribute to the support, maintenance, and repair of neurons. See astrocyte, ependymal cell, microglia, oligodendrocyte, Schwann cell.

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accessory nerve

Overview page. Subjects: Medicine and Health — Psychology.

Either of two pairs of eleventh cranial nerves, the motor nerves arising partly from the lateral walls of the medulla oblongata and partly from the cervical (neck) region of the spinal...

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accommodation

Overview page. Subjects: Medicine and Health — Psychology.

n. adjustment of the shape of the lens to change the focus of the eye. When the ciliary muscle (see ciliary body) is relaxed, suspensory ligaments attached to the ciliary body...

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accommodation reflex

Overview page. Subjects: Psychology — Medicine and Health.

(convergence reflex) a reflex that occurs when an individual focuses on a near object, in which the crystalline lens becomes more convex, the pupils constrict, and the eyes turn inwards.

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acellular

Overview page. Subjects: Medicine and Health — Biological Sciences.

Describing tissues or organisms that are not made up of separate cells but often have more than one nucleus (see syncytium). Examples of acellular structures are muscle fibres. Compare...

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acesulfame

Overview page. Subjects: Medicine and Health — Chemistry.

A group of non-nutritive or intense sweeteners. The potassium salt acesulphame-K is some 200 times as sweet as sucrose. It is not metabolized, and is excreted unchanged.

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