Question

Astronauts must perform isometric exercises when in outer space because bones atrophy under conditions of weightlessness or lack of ______.

Answer 1

Astronauts must perform isometric exercises in outer space to prevent bone atrophy due to weightlessness and lack of mechanical stress on bones.

Step-by-step explanation:

Astronauts must perform isometric exercises when in outer space because bones atrophy under conditions of weightlessness or lack of mechanical stress. The lack of gravitational forces in space leads to a loss of bone mass, as bones lose mineral salts and collagen fibers without mechanical stress. Isometric exercises help to stimulate the deposition of mineral salts and collagen fibers in bones, preventing bone atrophy.c