Physiological Effects of Spaceflight – Weightlessness: An Overview
The term “space physiology” means how bodily functions adapt to the environment of spaceflight, and how these adaptations affect performance and health. Thus, space physiology is a subdiscipline of “space biology” and encompasses how the systems of the body are affected by the spaceflight environment from the level of molecular interactions in the cells up to the integrated bodily functions. The spaceflight environmental factors that affect physiology and health are several of which weightlessness (microgravity) is dominant in low Earth orbit.
An object is weightless when it is not subjected to any external mechanical forces. A mechanical force is a force whereby an object accelerates another object through contact between their surfaces. This force is also referred to as the surface force or normal force. According to this definition, an object not subjected to any forces at all or only to gravitational forces without any intervening surface forces is weightless. Thus, a...
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