1 Membranes separate their contents from the environment. 2  Cell membranes separate the cell contents from its environment, and organelle membranes separate the organelle contents from their environment. 3  Membranes regulate the movement of materials through them.
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For the cycling team, see UnitedHealthcare (cycling team). UnitedHealth Group Inc. is an American managed health care company based in Minnetonka, Minnesota. It is 6th in the United States on the Fortune 500. UnitedHealth Group offers products and services through two operating businesses, UnitedHealthcare and Optum, both subsidiaries of UnitedHealth Group.