AP1 - Class 2: Chapter 5: Part 3 - Types of Glandular Secretions
There are 2 types of Glands
1. Exocrine glands; secrete into ducts 2. Endocrine glands; secrete into tissue fluid or blood
List the 3 types of glandular secretions (name of the glands)
1. Merocrine glands 2. Apocrine glands 3. holocrine glands
Exocrine glands are classified according to the organization of their cells. List the 4 types
1. simple glands 2. compound glands 3. tubular glands 4. alveolar glands
Apocrine Glands Description of secretion & example
Cellular product & portions of the free ends of glandular cells pinch off during secretion. They loose small portions of their cell bodies during secretion. E.g. mammary glands, ceruminous glands lining the external ear canal
Holocrine Glands Description of secretion & example
Disintegrated entire cells filled with secretory products. They release entire cells filled with secretory products. E.g. sebaceous glands of the skin
What are simple tubular glands
Straight tubelike gland that opens directly onto surface e.g. intestinal glands of small intestine
Merocine Glands Description of secretion & example
a fluid product released through the cell membrane by exocytosis with a high enzyme content. They release secretion without loosing cytoplasm. Most secretory cells are merocrine. Mucous cells secrete mucous. E.g. salivary glands, pancreatic glands, sweat glands of the skin
what are branched tubular glands
branched, tubelike gland; duct short or absent e.g. gastric glands
what are alveolar glands
consist of saclike dilations connected to the surface by narrowed ducts
what are tubular glands
consist of simple epithelium lined tubes that opens directly onto surface
Exocrine glands secrete into what
ducts
what are compound glands
have ducts that branch repeatedly before the secretory portion
what are simple glands
have ducts that do not branch before reaching the secretory portion
what are coiled tubular glands
long, coiled, tubelike gland; long duct e.g. eccrine (sweat) glands of skin
A gland consists of how many cells
one or more cell a) unicellular glands; e.g. Mucous-secreting goblet cell b) multicellular glands
what are compound tubular glands
secretory portions are coiled tubulus, usually branched e.g. bulbourethral glands of male
what are compound alveolar glands
secretory portions are irregularly branched tubulus with numerous saclike outgrowths
what are branched alveolar glands
secretory portions of gland expand into saclike compartments along duct e.g. sebaceous gland of skin
Endocrine glands secrete into what
tissue fluid or blood