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.
Definition: Contains the structures within the chest and abdomen Sentence: My ventral cavity protects my heart and other vital organs, so it is very vital. Anatomical Position Definition: standard position in which the body is facing forward, feet are parallel and facing forward, and the arms are at the sides with palms facing forward Sentence: The anatomical position is the position used when describing any part of the body.