The ideal internal conditfons necessary to maintain the bodies health is known as: Steady State Setpoints Feedback loop Homeostasis A small range of internal conditions that are balanced within the body as a whole: Steady State Negative Feedback Loop Homeostasis Positive Feedback Loop The movement of water molecules across a selectively permeable membrane is known as: Membrane Transport Osmolarity Osmosis Tonicity The ability of a particular solution to make water move across a membrane is known as: Osmosis Membrane Transport Tonicity Osmolarity.