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Tonofilaments
- keratin intermediate filaments that make up tonofibrils
- found in stratum spinosum
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Langerhan’s cells
- found in the stratum spinosum.
- These cells act as macrophages and engulf and digest pathogens.
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lamellated granules
- found in the stratum granulosum. Contain glycolipids
- which make the epidermis water-proof.
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keratohyaline granules
- found in the stratum granulosum.
- contain the tough, insoluble protein, keratin, which makes the epidermis tough and abrasive-resistant.
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nucleosome
the structural units of chromatin, packages chromatin
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What is a nucleotide made up of?
- · A pentose sugar (deoxyribose or
- ribose).
· A nitrogen-containing base – A, G, C, T, or U
· A phosphate group
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Coding Strand
the other DNA strand not used in transcription.
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Endothelium
- simple squamous epithelium
- lines blood vessels, circulatory system
-
Mesothelium
- serous membrane
- Main purpose is to create a lubricating fluid that is released between layers.
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Apocrine Secretion
- not found in humans, secretory product
- accumulates on the apical side of the cell’s cytoplasm.
- That part of the cytoplasm then pinches off, releasing the product into the lumen of the gland.
-
Merocrine Secretion
- cell secretes products via exocytosis
- eccrine sweat glands (regular sweat)
- apocrine sweat glands (yellowish, puberty)
-
Holocrine Secretion
- The cell accumulates secretory product within
- its cytoplasm.
- The cell then dies and its products are released into the lumen.
- A new layer of cells are ready to take its place.
- sebaceous oil glands
-
Meissner's Corpuscles
touch receptors found in the papillary layer
-
epidermal ridges
- fingerprints
- increase friction and gripping power
- we leave behind fingerprints because a film of sweat is left behind by the ridges.
-
What tissue is the reticular layer made of?
What is housed here?
- dense irregular connective tissue
- touch receptors for deep pressure (Pacinian corpuscles)
- stretch marks
-
Merkel Discs
- found at the junction of the epidermis and dermis.
- acts as light touch receptors
-
What are functions of the skin?
- protection from infection
- protection from UV radiation (melanocytes)
- temperature regulation
- metabolism (synthesis of vitamin D)
- receives stimuli from the environment
-
Pacinian corpuscles
- deep pressure receptors
- found in reticular layer
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