1. Compound tubular gland

2. Compound alveolar gland

Secretory portions are coiled tubules, usually branched Secretory portions are irregularly branched tubules with numerous saclike outgrowths

Bulbourethral glands of male (see fig. 22.1) Salivary glands (see fig. 17.12)

watery, has a high concentration of enzymes, and is called serous fluid. Such cells are common in the linings of the body cavities. Mucous cells secrete a thicker fluid mucus. This substance is rich in the glycoprotein mucin and is abundantly secreted from the inner linings of the digestive and respiratory systems.

Distinguish between exocrine and endocrine glands. Explain how exocrine glands are classified. Distinguish between a serous cell and a mucous cell.

Exocrine Glands


(a) Merocrine glands release secretions without losing cytoplasm. (b) Apocrine glands lose small portions of their cell bodies during secretion. (c) Holocrine glands release entire cells filled with secretory products.

Sebaceous gland

Demonstration Hurt Human Heart


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