Special Cell that forms Bone.
Ossification Center
The site of earliest Bone Formation.
Ossification
The process of Formation Bone.
Osmotic Pressure
An indication of the force of water movement into one solution from another solution separated by a Semipermeable Membrane. The result of the difference in solute concentration between the two solutions.
Osmosis
The net diffusion of water from a region of lower concentration of solute to a region of higher concentration of solute across a Semipermeable Membrane.
Osmoreceptor
Receptor that responds to changes in Osmotic Pressure in the Blood; Found in the Hypothalamus.
Orthostatic Hypotension
A sudden reduction in Blood Pressure when changing Posture.
Oropharynx
The part of the Pharynx Posterior the the Mouth.