write the structure of glandular epithelium no spam
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Answer:
Glandular epithelium is arranged into structures known as glands, which can either be a single cell or a group of cells specialized in producing and releasing a specific substance. There are a variety of glands releasing substances that perform important roles in the human body.
Answer:
GLANDULAR EPITHELIUM:
The glandular epithelium is a group of tissues, other than the covering and lining epithelium, which is specialized for the production and secretion of various macromolecules. Because of its primary function, the glandular epithelium is also called the secretory epithelium. This epithelium lies beneath the covering and lining epithelium and either consists of cells with specific functions or comprise specialized organs called glands. A gland consists of epithelium that secretes substances into ducts (tubes), onto a surface, or eventually into the blood in the absence of ducts. Some unicellular glands, comprised of specialized cells, might be interspersed between the simple cuboidal, simple columnar, and pseudostratified epithelia.
STRUCTURE:
1). Glands develop from covering epithelia in the fetus by cell proliferation and growth into the underlying connective tissue, followed by further differentiation.
2). The shape of the cells of the glandular epithelium can range from cuboidal to columnar as the squamous cells quite rare in the secretory epithelium.
3). The glandular epithelium of the endocrine glands is rich in vascularization as well as innervation.
4). The secretory cells in the glandular epithelium may synthesize, store, and release proteins (e.g., in the pancreas), lipids (e.g., adrenal, sebaceous glands), or complexes of carbohydrates and proteins.
5). The cells of some glands (e.g., sweat glands) have little synthetic activity and secrete mostly water and electrolytes (ions) transferred from the blood.