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10/1 D.N.A1) Compare & contrast Exocrine glands and

Endocrine Glands

5 Minutes

10/5 D.N.A1) Compare & contrast Exocrine glands and

Endocrine Glands– Exocrine glands release their secretions into

passageways called ducts that open onto an epithelial surface.

– Endocrine glands release their secretions into the interstitial fluid.

Glandular Epithelia

“Secretion of substances”

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Learning Objectives

1. Identify different types of secretion

2. Identify different exocrine gland structures & explain where they can be found in the body

3 Minutes

Secretion Methods

• Merocrine Secretion– Mucin: a merocrine secretion that mixes

with water to form mucus.

– Mucus: lubricant, protective barrier, trap for foreign particles/Microorganisms

– Ex || Salivary gland

Secretion Methods

• Apocrine Secretion– The apical portion of the cytoplasm is

packed with secretory vesicles and shed.

– Ex || Mammary Glands

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Secretion Methods

• Holocrine Secretion– Gland cell is destroyed, and further secretion

depends on destroyed cells being replaced

– Ex || Sebaceous glands associated with hair follicles.

Glandular Epithelia

• Glands: contain cells that make and secrete a particular product.

Endocrine Glands

• Ductless (no ducts) because they secrete their products internally.–They produce hormones, which enter

the blood and travel to target tissues.

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Exocrine Glands

• More numerous than endocrine glands.

• Secrete products onto body surfaces (skin) or into body cavities.

• 3 characteristics used to describe the structure:1. The structure of the duct2. The shape of the secretory area3. The relationship between the duct and

secretory area

Exocrine Glands

• Simple tubular– Single tube-shaped duct that does not

branch (coiled - simple coiled tubular)– Ex || Intestinal Glands

• Simple coiled tubular– Single tube-shaped duct that is coiled– Ex || Merocrine sweat glands

• Simple branched tubular– Single tube-shaped duct that branches out– Ex || Gastric glands, Mucous glands of the

esophagus, tongue, & duodeum

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Exocrine Glands

• Simple alveolar (acinar)– Single bulb-like duct that does not

branch– Ex || Only found in embryonic

development

• Simple branched alveolar– Single bulb-like duct that branches out– Ex || Sebaceous glands

Exocrine Glands

• Compound Tubular– Several, branched ducts with tube-like shape– Ex || Mucous glands in mouth, Seminiferous

tubules of testes

• Compound Alveolar– Several, branched ducts with bulb-like shape– Ex || Mammary glands

• Compound Tubuloalveolar– Several, branched ducts with both tube-like

AND bulb-like shapes– Ex || Salivary glands & pancreas

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