1 Low blood levels of calcium may be caused by low levels of protein (albumin) in the blood, because about half of all calcium in the blood is attached to albumin. 2  For this reason, an ionized calcium level (which is not attached to albumin) and a blood albumin level may also be measured. Low blood levels of calcium may be caused by low levels of protein (albumin) in the blood, because about half of all calcium in the blood is attached to albumin. 2  For this reason, an ionized calcium level (which is not attached to albumin) and a blood albumin level may also be measured.
Manitou Cliff Dwellings. The Manitou Cliff Dwellings are a group of relocated Anasazi ruined cliff dwellings and a museum located just west of Colorado Springs, Colorado on U.S. Highway 24 in Manitou Springs. The Anasazi Museum was established in 1904 and opened to the public in 1907.
Mesa Verde. This World Heritage Site preserves more than 600 cliff dwellings typical of the Ancestral Puebloan culture, which lasted from about 450 to 1300. The allure of this park is not only the remarkable ruins, but also the mystery of the people who inhabited them. Updates on Mesa Verde.