Glandular Epithelium

Glandular epithelium is more complex and varied than the epithelial cells which cover surfaces or line tubules or vessels. Glandular epithelium is more complex and varied than the epithelial cells which cover surfaces or line tubules or vessels.

Glandular Epithelium Glandular epithelium is more complex and varied than the epithelial cells which cover surfaces or line tubules or vessels. Glandular epithelium is more complex and varied than the epithelial cells which cover surfaces or line tubules or vessels. Glandular epithelium form glands which can consist of one or more cells that make and secrete a product. Glandular epithelium form glands which can consist of one or more cells that make and secrete a product.

Products Water soluble protein Water soluble protein

Products Water soluble proteins Water soluble proteins Nonpolar lipids or steroids Nonpolar lipids or steroids

Classification Glands are classified first based on the presences or absence of a duct for the secretory products. Glands are classified first based on the presences or absence of a duct for the secretory products.

Endocrine Glands Are ductless glands Are ductless glands Secrete their products directly into the capillaries. Secrete their products directly into the capillaries.

Exocrine Glands secrete their products onto a body surface or a cavity. secrete their products onto a body surface or a cavity.

Exocrine Glands secrete their products onto a body surface or a cavity. secrete their products onto a body surface or a cavity. are classified first based on cell number are classified first based on cell number

Unicellular Exocrine Glands are made of up of single cells which secrete their products directly through exocytosis onto a surface. are made of up of single cells which secrete their products directly through exocytosis onto a surface.

Unicellular Exocrine Glands are made of up of single cells which secrete their products directly through exocytosis onto a surface. are made of up of single cells which secrete their products directly through exocytosis onto a surface. The only major examples are the goblet cells and mucous cells The only major examples are the goblet cells and mucous cells

Unicellular Exocrine Glands found mixed with the columnar epithelium in the digestive and respiratory tracts. found mixed with the columnar epithelium in the digestive and respiratory tracts. They secrete products called mucins (mucous), glycoproteins that lubricate. They secrete products called mucins (mucous), glycoproteins that lubricate.

Multicellular Exocrine Glands are made up many cells and are composed of two parts. are made up many cells and are composed of two parts.

Multicellular Exocrine Glands are made up many cells and are composed of two parts: are made up many cells and are composed of two parts: A epithelial lined duct A epithelial lined duct A secretory unit called the acinus A secretory unit called the acinus

Multicellular Exocrine Glands Supportive connective tissue surrounds the secretory unit and provides blood vessels and nerve fibers. Supportive connective tissue surrounds the secretory unit and provides blood vessels and nerve fibers.

Multicellular Exocrine Glands Supportive connective tissue surrounds the secretory unit and provides blood vessels and nerve fibers. Supportive connective tissue surrounds the secretory unit and provides blood vessels and nerve fibers. The shape of the duct and of the secretory unit provides for another level of classification. The shape of the duct and of the secretory unit provides for another level of classification.

Duct Structure Simple- unbranched, straight duct Simple- unbranched, straight duct

Duct Structure Simple- unbranched, straight duct Simple- unbranched, straight duct Compound- branched duct Compound- branched duct

Secretory Unit: Tubular- if the secretory unit has the same diameter throughout like a tube Tubular- if the secretory unit has the same diameter throughout like a tube

Secretory Unit Tubular- if the secretory unit has the same diameter throughout like a tube Tubular- if the secretory unit has the same diameter throughout like a tube Alveolar- if the secretory unit is in the shape of a flask Alveolar- if the secretory unit is in the shape of a flask both of these terms refer to the acinus or secretory unit. both of these terms refer to the acinus or secretory unit.

Examples

Method of Secretion Glands regardless of type (unicellular or multicellular) can have one of two types of secretory processes: Glands regardless of type (unicellular or multicellular) can have one of two types of secretory processes:

Method of Secretion Glands regardless of type (unicellular or multicellular) can have one of three types of secretory processes: Glands regardless of type (unicellular or multicellular) can have one of three types of secretory processes: Merocrine- products are secreted by exocytosis. This is seen with most glands. Merocrine- products are secreted by exocytosis. This is seen with most glands.

Method of Secretion Glands regardless of type (unicellular or multicellular) can have one of three types of secretory processes: Glands regardless of type (unicellular or multicellular) can have one of three types of secretory processes: Merocrine- products are secreted by exocytosis. This is seen with most glands Merocrine- products are secreted by exocytosis. This is seen with most glands Holocrine- the cell ruptures and releases the product. New cells replace the spent cells. The only example in humans are the sebaceous (sweat) glands Holocrine- the cell ruptures and releases the product. New cells replace the spent cells. The only example in humans are the sebaceous (sweat) glands

Method of Secretion Apocrine-the top of the cell pinches off. Possibly seen in the lactating mammary gland although this is generally considered merocrine in nature. Apocrine-the top of the cell pinches off. Possibly seen in the lactating mammary gland although this is generally considered merocrine in nature.