Here are 10 things you may not know about Lean: 1  Codeine, one ingredient in âLeanâ is an opiate similar to: Heroin, Morphine, Oxycontin or Vicodin. 2  Weâve coined Lean as, âHip-Hopâs New Heroinâ. 3  Not a good look by the way, if youâve ever seen a heroin addict.
Most animals have three major pairs of salivary glands that differ in the type of secretion they produce: 1  parotid glands - produce a serous, watery secretion. 2  submaxillary (mandibular) glands - produce a mixed serous and mucous secretion. 3  sublingual glands - secrete a saliva that is predominantly mucous in character.
Secretions can be increased by the presence, thought, or smell of food and also by thermal stimulation. In addition to numerous small glands in the tongue, palate, lips, and cheeks, human beings have three pairs of major salivary glands that open into the mouth through well-developed ducts. The parotid salivary glands, the largest of the three, are located between the ear and ascending branch of the lower jaw. Each gland is enclosed in a tissue capsule and is composed of fat tissue and cells that secrete mainly serous fluids. Each glandâs major duct (Stensenâs duct) opens in the rear of the mouth cavity near the second upper molar.