snare drum definition. A shallow cylindrical drum, with wires or pieces of catgut (snares) stretched across the bottom skin to give a sharp, rattling sound when the top skin is struck. Snare drums are used in orchestras and in nearly all kinds of bands. Discover our greatest slideshows.
Although some mucins are membrane-bound due to the presence of a hydrophobic membrane-spanning domain that favors retention in the plasma membrane, most mucins are secreted onto mucosal surfaces or secreted to become a component of saliva.ature mucins are composed of two distinct regions: 1  The amino-and carboxy-terminal regions are very lightly glycosylated, but rich in cysteines. 2  A large central region formed of multiple tandem repeats of 10 to 80 residue sequences in which up to half of the amino acids are serine or threonine.
There are two major types of saliva that are secreted from the salivary glands and they are serous and mucinous. The submandibular gland is the only mixed salivary gland that secretes both types in a 3:2 ratio of serous to mucous respectively. The parotid gland is the only gland that secretes purely serous saliva, while the sublingual gland and minor salivary glands secrete purely mucinous saliva. The total daily output of saliva in an adult is between one and one and a half liters of saliva.