Symmetrical if footfalls of the two feet of a pair are evenly spaced in time. Energy saving for different gaits. Angle of scapula Elastic recoil. Bends Oxygen toxicity Narcotic effects of gases Direct effects of pressure Hypoxia Bends - divers disease, caissons disease and aeroembolism. Occurs when a human diver returns to the surface after some time below the water at depths greater then 10m or 1atm.
Severity increases with time and depth.
It is gas bubbles forming in the tissues and the bloodstream. Soda water when opened. Bubbles appear when the pressure is reduced over a liquid that is saturated with gas at higher pressure. Form in joints which is painful. If occur in bloodstream they block the finer vessels and when happens in nervous system is particularly dangerous.