Scenario
Osteoporosis is a disease characterized by loss of bone mass and an increased susceptibility to bone fractures. It threatens more than half of all Americans over the age of 50. Women are about four times more likely to suffer from the disease than men. Osteoporosis may progress undetected until bones become so weak that they break during common activities. Prevention of osteoporosis includes regular weight-bearing exercise, recommended intake of calcium and vitamin D, and avoidance of smoking and excessive alcohol.
-Astronauts returning from long periods in space often have very fragile bones. This is likely related to ________.

Question

Quizplus · Accepted Answer

Lack of gravity in space causes astronauts' bones to become fragile because it reduces the amount of weight-bearing exercise they receive.

Scenario Osteoporosis Is a Disease Characterized by Loss of Bone Mass