What does SI mean? Definitions for SI Here are all the possible meanings and translations of the word SI.
The sebaceous glands are microscopic exocrine glands in the skin that secrete an oily or waxy matter, called sebum, to lubricate and waterproof the skin and hair of mammals.ebaceous glands secrete the oily, waxy substance called sebum (Latin: fat, tallow) that is made of triglycerides, wax esters, squalene, and metabolites of fat-producing cells. Sebum waterproofs and lubricates the skin and hair of mammals.
Sebaceous glands. - oil producing-holocrine-associated with hair follicles-sebum secreting secrete products via apoptosis-secrete products mostly onto hair follicles-lanolin-usually opens up into a hair follicle-coats the scalp hair with oil-blockage and infection can cause pimples-form of sudoriferous gland.- modified mammary glands. sweat secreting-eccrine-merocrine-secrete products via exocytosis-apocrine-mammary glands-secrete directly onto the skin surface-secretions are 99% water and slightly acidic pH-simple tubular structures-responsible for diaphoresis-secretion of pheromones.