Blood pressure generally refers to the arterial pressure in the systemic circulation. An increase in the number of white blood cells in circulation is called leukocytosis. Neutrophilia is an increase in the absolute neutrophil count in the peripheral circulation. Subsequent investigation showed rapid conversion occurs during its passage through the pulmonary circulation. The lungs have a dual blood supply provided by a bronchial and a pulmonary circulation. Spallanzani studied and made important descriptions on blood circulation and respiration. Further maturation occurs in the peripheral circulation. It is also indicated by congestion of the pulmonary circulation. There is a continuous circulation of water in the oceans. LVEF is an indicator of the effectiveness of pumping into the systemic circulation. This is associated with the dominance of the coronary artery circulation. This is done to treat or prevent problems with distal circulation, or ventilation. Another possibility is that there was a slowing of thermohaline circulation. It leads to functional leptin deficiency with high leptin levels in circulation. Pulmonary embolism refers to an embolus that lodges in the pulmonary circulation.