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Definition of islet of Langerhans, copper, epimer, trace element, substituent, smooth muscle, exocrine gland, toxin, onset, agent

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Definition of islet of Langerhans (noun)
form plural: islets of Langerhans

groups or islands of cells in the pancreas

Examples
The islets of Langerhans are the pancreatic areas where glucagon, gastrin and insulin are made.

Definition of islet of Langerhans
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Definition of copper (noun)
form: no plural

unreactive metallic element with chemical symbol Cu that is essential for red blood cell formation

Examples
Copper is an excellent conductor and so is used to make electricity cables.

Definition of copper
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Definition of epimer (noun)
form plural: epimers

molecule differing only in the spatial arrangement around a single carbon atom

Examples
Aldose diastereomers differing about the configuration of one carbon are called epimers.

Definition of epimer
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Definition of trace element (noun)
form plural: trace elements

element which is present in very small amounts in living things

Examples
Iodine and copper are trace elements.

Definition of trace element
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Definition of substituent (noun)
form plural: substituents

atom, radical, or group replaced for another in a chemical molecule

Examples
Each substituent is apportioned a number to identify its point of attachment to the principal chain of an alkane.

Definition of substituent
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Definition of smooth muscle (noun)
form: no plural

muscle that produces slow, long-term contractions; found in hollow organs

Examples
The stomach, intestines and bladder are lined with smooth muscle.

Definition of smooth muscle
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Definition of exocrine gland (noun)
form plural: exocrine glands

a gland that secretes the substances it makes outside of the body

Examples
The sudoriparous and the salivary glands are exocrine glands.

Definition of exocrine gland
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Definition of toxin (noun)
form plural: toxins

poisonous substance

Examples
Bacteria make toxins that cause illness. White blood cells make antitoxins that destroy toxins.

Definition of toxin
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Definition of onset (noun)
form plural: onsets

the beginning

Examples
The onset of menstruation is brought about by hormonal changes.

Definition of onset
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Definition of agent (noun)
form plural: agents

a substance that induces a reaction or effect

Examples
The chemical agent used to stain.

Definition of agent
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