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Brunner’s glands

Noun 1. Are compound tubular submucosal glands found in that portion of the duodenum which is above the hepatopancreatic sphincter (Sphincter of Oddi). The main function of these glands is to produce a mucus-rich alkaline secretion (containing bicarbonate) in order to: protect the duodenum from the acidic content of chyme (which is introduced into the duodenum from the stomach); provide an alkaline condition for the intestinal enzymes to be active, thus enabling absorption to take place; lubricate the intestinal walls. They also secrete urogastrone, which inhibits parietal and chief cells of the stomach from secreting acid and their digestive enzymes. This is another form of protection for the duodenum. They are the distinguishing feature of the duodenum. ( Syn: duodenal...

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Building biology

Noun 1. Branch of biology that deals with the study of the indoor living environment. ( 2. A field of building science investigating the indoor living environment for a variety of irritants. (Wikipedia) Syn:...

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Bulbourethral gland

1. An exocrine gland which secretes a clear fluid known as pre-ejaculate or Cowper’s fluid (colloquially known as “pre-cum”) which is generated upon sexual arousal. ( 2. Also called a Cowper’s gland for anatomist William Cowper, is one of two small exocrine glands present in the reproductive system of male mammals (including humans). They are homologous to Bartholin’s glands in females. ( 3. Either of two glands that discharge a component of seminal fluid into the urethra; homologous to Bartholin’s gland in the female. ( 4. One of a pair of glands near the base of the penis in the human male that secretes fluid that lubricates and neutralizes acids in the urethra during sexual arousal. ( Syn: Cowper’s...

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Bundle of His

Noun, pl. bundles of His 1. A collection of heart muscle cells specialized for electrical conduction that transmits the electrical impulses from the AV node (located between the atria and the ventricles) to the point of the apex of the fascicular branches. ( 2. Specialized heart muscle cells that transmit electrical impulses from the AV node in the heart to the muscle cells of the heart wall, which contract in response producing the heart beat. ( 3. The bundle of cardiac muscles beginning at the trunk of the atrioventricular node, passing through the right atrioventricular fibrous ring, then, extends to the membranous portion of the interventricular septum. Its function involves electrical conduction, transmitting the electrical impulses from the atrioventricular node to the apex of the fascicular branches. ( Syn: atrioventricular bundle, AV bundle, fasciculus atrioventricularis, atrioventricular band, gaskells bridge, His band, His bundle, Keiths bundle, Kents bundle, Kent-His bundle, ventriculonector Name origin: Named for Swiss cardiologist Wilhelm His, Jr., who discovered the function of these cells in...

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