Study Set Content:
- gland with several tubular secretory portions branching from the single duct
Simple branched tubular
glands with a single sac-like secretory portion
Simple acinar
- glands with several acinar secretory portions branching from the single duct
Simple branched acinar
- glands with multiple ducts, each with a narrow tubular secretory portion
Compound tubular
- glands with multiple ducts, each with a several sac-like secretory portions
Compound acinar
- glands with multiple ducts, each with several tubular and acinar secretory portions
Compound tubuloacinar
Cells of the gland produce secretions by active transport or produce vesicles that contain secretory products, and the vesicles empty their contents into the duct through exocytosis.
Merocrine gland
Secretory products are stored in the cell near the lumen of the duct. A portion of the cell near the lumen containing secretory products is pinched off the cell and joins secretions produced by a merocrine process.
Apocrine gland
Secretory products are stored in the cells of the gland. Entire cells are shed by the gland and become part of the secretion. The lost cells are replaced by other cells deeper in the gland.
Holocrine gland
can also be classified according to their modes of secretion.
Exocrine glands
- secretion involves the release of secretory products by exocytosis
Merocrine
- secretion involves the release of secretory products as pinched-off fragments of the gland cells.
Apocrine
- secretion involves the shedding of entire cells.
Holocrine
- is a diverse primary tissue type that makes up part of every organ in the body.
Connective tissue
Connective tissue differs from the other three tissue types in that it consists of cells separated from each other by abundant
extracellular matrix
Connective tissue is comprised of
cells, fibers, protein, extracellular matrix
Functions of Connective Tissue
1. Enclose and separate other tissues
2. Connecting tissues to one another
3. Supporting and moving parts of the body
4. Storing compound
5. Cushioning and insulating
6. Transporting
7. Protecting
The specialized cells of the various connective tissues produce the
extracellular matrix
- form bone, osteocytes maintain it, and osteoclasts break it down.
Osteoblasts
- are cells that form fibrous connective tissue, and fibrocytes maintain it.
Fibroblasts
