If gases are directed upward, they will exert a downward force and counteract muzzle rise. Advocacy groups can also exert influence on political parties. They are thereby in a state of readiness to exert themselves. However, female sensuality does exert a paralyzing, ultimately destructive influence. Advocacy groups can also exert influence through the assembly by lobbying. Spain is ranked as a middle power able to exert modest regional influence. Estimates suggest their large jaws could exert a bite force of up to . The chain is flexible so it can only exert a force parallel to itself. Some act as local anesthetic counterirritants and, thereby, exert an antitussive effect. Particle does not exert a force on itself. They may exert their effect locally or produce systemic effects. However, fluids can exert pressure normal to any contacting surface. Here, the Andes exert an important influence on the climate. This results in being able to exert greater physical effort at altitude. Main suggested that this may exert pressure, causing the accumulation of fluid.