Lens and Cataracts

The eye lens (see Figure 68.2), which contains perhaps the highest concentration of proteins found in any tissue, transmits and focuses light onto the retina. It is formed of a single cell type that differentiates from an anterior layer of cuboidal epithelia and migrates posteriorly to form elongated lens fiber cells that make up the lens nucleus. In this process, the developing fiber cells synthesize high levels of lens crystallins before losing their nuclei and mitochondria. Thus, the lens fiber cells lack aerobic metabolism and contain high concentrations of a-crystallins, which are members of the small heat shock protein family and have chaperone activity; and fiy-crystallins, which are related to prokaryotic structural proteins.

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Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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