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| | AllRefer.com - gland (Anatomy And Physiology) - Encyclopedia |
 | | The endocrine glands, e.g., the thyroid, adrenals, and pituitary, produce hormones that are secreted directly into the bloodstream (see endocrine system). |
 | | Some glands have dual functions, e.g., the liver, pancreas, ovary, and testis produce both a secretion that is emitted through a duct and a hormone that is taken up by the blood. |
 | | There are specialized exocrine glands in the animal world that produce such substances as the shells of bird eggs, spiderwebs, and the cocoons of the silkworm larvae. |
| reference.allrefer.com /encyclopedia/G/gland.html (337 words) |
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