ANATOMY

Detailed explanation-1: -Two principal types of glands exist: exocrine and endocrine. The key difference between the two types is that, whereas exocrine glands secrete substances into a ductal system to an epithelial surface, endocrine glands secrete products directly into the bloodstream [1].

Detailed explanation-2: -Functioning as an exocrine gland, the pancreas secretes enzymes to break down the proteins, lipids and carbohydrates in food. Functioning as an endocrine gland, the pancreas secretes the hormones insulin and glucagon to control blood sugar levels throughout the day.

Detailed explanation-3: -Exocrine glands consist of two main parts, a secretory unit and a duct. The secretory unit consists of a group of epithelial cells, which release their secretions into a lumen. A duct is lined with epithelium and is involved in transporting the secretions from the secretory unit to an epithelium-lined surface.

Detailed explanation-4: -Holocrine Glands. Merocrine Glands. Apocrine Glands.