Since the concept of being below is itself somewhat vague, scientists define the nadir in more rigorous terms. Specifically, in astronomy, geophysics and related sciences (e.g., meteorology), the nadir at a given point is the local vertical direction pointing in the direction of the force of gravity at that location.
anatomical dead space. In pulmonary physiology, the area in the trachea, bronchi, and air passages containing air that does not reach the alveoli during inspiration and is not involved in gas exchange. This is termed dead space because the air does not reach the alveoli and is not involved in gas exchange. Normal anatomical dead space is 2.2 ml/kg or 1 ml/lb.
This article is about the orbit, the anatomical space that contains the eye. For other uses of orbit or orbita see Orbit (disambiguation) and Orbita (disambiguation) . In anatomy, the orbit is the cavity or socket of the skull in which the eye and its appendages are situated.Orbit can refer to the bony socket, or it can also be used to imply the contents. In the adult human, the volume of the orbit is 30 mL, of which the eye occupies 6.5 mL.his article is about the orbit, the anatomical space that contains the eye. For other uses of orbit or orbita see Orbit (disambiguation) and Orbita (disambiguation) . In anatomy, the orbit is the cavity or socket of the skull in which the eye and its appendages are situated.