Epithelial Tissue: Glandular Epithelium Classification

Defining Characteristics of Glandular Epithelium

• Composed of specialized cells that produce and secrete various substances such as hormones, enzymes, and mucus.

Differences Between Exocrine and Endocrine Glands

• Exocrine glands secrete products through ducts to the surface or cavity (e.g., sweat glands, salivary glands).
• Endocrine glands release hormones directly into the bloodstream, allowing for systemic distribution (e.g., thyroid, adrenal glands).

Ductless Exocrine Gland

• Goblet cells are a type of exocrine gland that does not have a duct and secretes mucus directly onto the free surface.

Simple vs. Compound Exocrine Glands

• Simple exocrine glands consist of a single duct and are unbranched (e.g., simple tubular glands).
• Compound exocrine glands have multiple ducts and branched structures (e.g., compound acinar glands).

Methods of Secretion in Exocrine Glands

• Exocrine glands utilize methods such as merocrine (exocytosis), apocrine (partial loss of the cell), and holocrine (complete cell disintegration) for secretion.
• Not all glands use the same method; for example, some do not utilize apocrine secretion.

Features of Multicellular Exocrine Glands

• Comprised of multiple cells forming a structure with either a simple or branched duct system, allowing for more complex secretory functions.

Common Unicellular Exocrine Gland

• Goblet cells are the most common unicellular exocrine glands, primarily found in the respiratory and intestinal tracts.

Shared Characteristic of Simple and Compound Exocrine Glands

• Both types have the primary function of secreting substances to specific sites, aiding in processes like digestion and lubrication.