Final answer:
Multicellular exocrine glands can be classified functionally into merocrine, holocrine, and apocrine divisions based on the mechanism of secretion.
Step-by-step explanation:
Multicellular exocrine glands can be classified functionally into merocrine, holocrine, and apocrine divisions. Merocrine glands release their secretions by exocytosis, while apocrine glands release their secretions by pinching off a portion of the cell, and holocrine glands release their secretions by rupturing the entire cell. These classifications are based on the mechanism of secretion of these glands.