Diseases, Conditions, Syndromes

Could loss of smell from COVID-19 create future 'dementia wave?'

A review of studies about the effect of SARS-CoV-2—the virus that causes COVID-19—on the olfactory system introduces questions about whether loss of smell associated with COVID-19 infection may increase the risk of developing ...

Genetics

Study finds loss of 'youth' protein may drive aging in eye

Loss of the protein pigment epithelium-derived factor (PEDF), which protects retinal support cells, may drive age-related changes in the retina, according to a new study in mice from the National Eye Institute (NEI). The ...

Medical research

New stem cell mechanism discovered in the gut

A special layer of cells that coats the insides of the small and large intestines takes in nutrients and water while keeping anything bad from circulating. This layer is called the intestinal epithelium. It completely renews ...

Diseases, Conditions, Syndromes

Eyes a haven for Ebola and other viruses

A specific cell within our retina, the light-sensitive part of our eyes responsible for sending visual information to our brain, appears to be particularly good at housing Ebola and other viruses, new research has found.

Genetics

Streamlining stem cells to treat macular degeneration

As we age, so do our eyes; most commonly, this involves changes to our vision and new glasses, but there are more severe forms of age-related eye problems. One of these is age-related macular degeneration, which affects the ...

Genetics

Researchers discover new genetic eye disease

Researchers from the National Eye Institute (NEI) have identified a new disease that affects the macula, a small part of the light-sensing retina needed for sharp, central vision. Scientists report their findings on the novel ...

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Epithelium

Epithelium is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue. Epithelial tissues line the cavities and surfaces of structures throughout the body, and also form many glands. Functions of epithelial cells include secretion, selective absorption, protection, transcellular transport and detection of sensation. In Greek "Epi" means, "on, upon," and "Theli" meaning "tissue." Epithelial layers are avascular, so they must receive nourishment via diffusion of substances from the underlying connective tissue, through the basement membrane.[unreliable source?] Epithelia can also be organized into clusters of cells that function as exocrine and endocrine glands. Exocrine and endocrine epithelial cells are highly vascular.

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