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.
The parotid glands are a pair of major salivary glands wrapped around the mandibular ramus in humans. The largest of the salivary glands, they secrete saliva to facilitate mastication and swallowing and to begin the digestion of starches. It is the serous type of gland which secretes the ptyalin.It enters the oral cavity via the parotid duct or Stensen duct.he largest of the salivary glands, they secrete saliva to facilitate mastication and swallowing and to begin the digestion of starches. It is the serous type of gland which secretes the ptyalin. It enters the oral cavity via the parotid duct or Stensen duct.