Exocrine
Exocrine: Pertaining to the secretion of a substance out through a duct. The exocrine glands include the salivary glands, sweat glands and glands within the gastrointestinal tract. Exocrine is as opposed to endocrine which refers to the secretion of a substance (a hormone) into the bloodstream. The exocrine glands are the “glands of external secretion” while the endocrine glands are “glands of internal secretion.”
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- Exocrine gland
Exocrine gland: A gland that secretes a substance out through a duct. The exocrine glands include the salivary glands, sweat glands and glands within the gastrointestinal tract. The exocrine glands are the “glands of external secretion.”
- Exogenous
Exogenous: Originating from outside the organism. Insulin taken by a diabetic is exogenous insulin.
- Exon
Exon: The region of a gene that contains the code for producing protein. Each exon codes for a specific portion of the complete protein. Exons are separated by introns, long regions of DNA that have no apparent function. Exons are also called coding DNA.
- Exomphalos-macroglossia-gigantism syndrome
Exomphalos-macroglossia-gigantism syndrome: See: Beckwith-Wiedemann syndrome.
- Exonuclease
Exonuclease: An enzyme that cleaves nucleotide bases sequentially from the free ends of a nucleic acid (DNA or RNA).