Distinguish between Simple gland and compound gland
Simple tubular glands have cells arranged in "test tube" shaped secreting units. The secretion is pushed out through a single duct. Simple tubular glands (colon) Simple alveolar glands have their cells arranged in "sac-like" structures that secrete through single ducts. gland composed of a branching system of ducts that combine, eventually opening into a secretory duct.
