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the number of times greater an image is than the actual object


abnormal nutrition, usually nutritional deficiency but may also mean  excess of nutrition


skin conditions caused by a variety of mites



Maximum Permissible Dose (MPD)

an amount of radiation exposure whichis considered no more hazardous than that which could be encountered on a day to day basis

Mechanical vector

the organism is only carried by the host and does not undergo any development inside the host


large cells, found in the bone marrow, that break up to form platelets, which are important in the clotting mechanism of blood

Meibomian glands

modified sebaceous glands present in the eyelids which produce an oily secretion, which helps to prevent the eye from drying out. Also called tarsal glands.


cell division involved in ova and sperm production. Four haploid cells are produced, each with half the number of chromosomes than the parent cell.


cell in the skin that produces and contains the pigment called melanin

Mendel's First Law of Inheritance - the Law of Segregation

at meiosis only one of the two alleles is transmitted to each gamete

Mendel's Second Law of Inheritance - the Law of Independent Assortment

each pair of genes is inherited without being influenced by the presence of other genes

Metabolic acidosis

acidic plasma pH due to a metabolic process. A common example of this is diarrhoea, resulting in acidosis.

Metabolic alkalosis

less acidic plasma pH due to a metabolic process. A common example of this is acute vomiting resulting in a loss of hydrogen ions from the stomach. Chronic vomiting will result in metabolic acidosis due to a loss of bicarbonate from intestinal contents.


the sum of the physical and chemical changes that take place in living organisms. These changes include both synthesis (anabolism) and breakdown (catabolism) of substances in the body.


an organism too small to be seen by the naked eye; a microscopic organism


protein structures that help cells maintain their shape and are involved in cell movement and cell structure


the act of expelling urine from the bladder

Milk teeth

see deciduous teeth

Milliamperes (mA)

combination of the mA and exposure time which dictates the number of X-rays produced during an exposure


membrane-bound organelle that is the site of aerobic respiration in the cell


the division of the nucleus that results in two diploid cells with exactly the same number and type of chromosomes as the parent cell

Mixed nerve

contains both sensory and motor fibres

Modified transudate

transudate with a high protein and cell content, as in inflammation. Eventually, modified transudate may become exudate


type of agranular white blood cell


stomach with only one compartment

Monosynaptic reflex

a reflex that only involves a single set of synapses

Motor fibres

nerve fibres that carry impulses away from the central nervous system


Organisms that consist of more than one cell


give birth to more than one offspring; litter-bearing


abnormal heart sound created by alteration of blood flow through the heart

Mutualistic bacteria

an association between organisms of two different species in which each member benefits


prokaryotic organism that does not have a cell wall

Myelin sheath

the insulating, fatty layer, produced by Schwann cells, that surrounds the axon in some nerves


diagnostic imaging procedure, whereby contrast agent is injected into the cerebrospinal fluid


contractile protein found in muscle fibres

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