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Johnemt
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4 types of adhering junctions?
- Tight junctions
- adhering junctions
- desmosomes
- gap junctions
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What do tight junctions do?
- fuse outer surfaces of plasma membranes
- tightly join apical surface
- prevents transport between cells/membranes
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what do adhering junctions do?
- join proteins between cells and anchoring of the
- cellular skeleton
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what do desmosomes do?
- similer to the adhering junctions
- spot-weld-like junctions for stress points.
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simple duct structure
unbranched
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compound duct structure
branched
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acinar/alveolar shape
rounded secretory portion
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4 types of simpmle structures
- simple tubular
- simple branched tubular
- simple coiled tubular
- simple branched acinar
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Endocrine Gland
Ductless glands that secrete hormones into the blood
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Exocrine Gland
ducted glands that secrete their products onto a surface
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example of simple tubular gland
large intestine
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Simple Branched Tubular
(e.g. gastric glands)
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Simple Coiled Tubular
(e.g. sweat glands)
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Simple Branched Acinar
(e.g. sebaceous glands)
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Compound Tubular
(e.g. bulbourethral glands)
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Compound Acinar
(e.g. mammary glands)
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Compound Tubuloacinar
(e.g. pancreatic glands)
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how is the Merocrine secretes
released in vesicles
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How does the apocrine secrete
- secretions builds up at the apical surface
- apical portion pinches off; then cell repairs itself
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how does the holocrine gland secrete?
- secretions accumulates in the cytosol
- cell then ruptures
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