Biology Questions and Answers
squamous epithelium is made of the
same type of flat cells placed in severalsuperimposed layers.
The simple sfound in the pulmonary quamous epithelium isalveoli. The (^)
stratified squamous epithelium can be
found in the moistmucosae of the mouth, esophagus an mucosae, like the (^) d
vagina, and it is the epithelium of the
skin.
- What is the function of
keratin in the epidermis?
The epidermis is the outer layskin made of epithelial tissue. In theer of the
epidermis there are keratin-secreting
cells (kinsoluble protein that imeratinocytes). Keratin is anpregnates th (^) e
surface of the skin pand impermeability. In mammalsroviding protection
keratin also forms the hairs.
The keratinizform the corneal layer. ed cells of the skin surThese cells dieface
and are continuously replaced byothers.
- How different is the fish
epidermis from the amphibian
epidermis?
The fish epidermis is very contains mucus-secreting cells. The fishthin and (^)
skin does not present keratin. The
mucus has a palso helps the slidinrotective fg of the animalunction and it
under water. (The fish scalesfrom the dermis and not from the originate
epidermis.)
In amphibians there is already a slight
keratinization ofadditional adaptation to th the skin, pre terrestrialobably an (^)
environment. Amphibians have smooth
and wet epidermis without scales.features facilitate their cutaneous These
respiration.
- Which are the glands
present in the epidermis of
mammals, birds and reptiles?
In the epidermis of birds and reptiles
there are practicallymammals there are sweat g no glands. Inlands a (^) nd
sebaceous glands.
- What are melanocytes?
Melanocytes are epithelial cells of the
skin specialized Melanin is a pigment that besidesin secretion of melanin.
coloring the skin, the iris of the eye and
the hair, the ultraviolet raalso works as a filter diation of the sun thusagainst (^)
protecting effects of this rathe body agaidiation (mainly bnst the harmfulurns
and carcinogenic mutations).
Melanocytes arof the more deadly skin cancers:e the cells affected in one
melanoma.
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