1. Simple tubular gland

2. Simple coiled tubular gland

3. Simple branched tubular gland

4. Simple branched alveolar gland

Straight tubelike gland that opens directly onto surface

Long, coiled, tubelike gland; long duct

Branched, tubelike gland; duct short or absent

Secretory portions of gland expand into saclike compartments along duct

Intestinal glands of small intestine (see fig. 17.3) Eccrine (sweat) glands of skin (see fig. 6.11) Mucous glands in small intestine (see fig. 17.3) Sebaceous gland of skin (see fig. 5.12)

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