What are examples of landforms? A: The four main types of landforms are mountains, plateaus, plains and hills. A landform is defined as any natural feature on the Earth's surface, which incl... Full Answer >
Definition of leukopenia. : a condition in which the number of white blood cells circulating in the blood is abnormally low.
To begin to answer that question, we must define osteopenia. Osteopenia is the thinning of bone mass. While this decrease in bone mass is not usually considered severe, it is considered a very serious risk factor for the development of osteoporosis. Osteopenia is commonly seen in people over age 50 that have lower than average bone density but do not have osteoporosis. The diagnostic difference between osteopenia and osteoporosis is the measure of bone mineral density. Osteoporosis, the fragile bone disease, is characterized by a loss of bone mass caused by a deficiency in calcium, vitamin D, magnesium and other vitamins and minerals.