Vascular ultrasonography helps determine multiple factors within the circulatory system. Proponents claim improvement in circulatory system and lymphatic drainage. The lymphatic system is part of the circulatory system. Lameness can also be caused by abnormalities in the digestive, circulatory and nervous systems. The animal lacks respiratory, excretory, and circulatory systems. Sponges do not have nervous, digestive or circulatory systems. Medications may include pain management, medications that promote circulation in the circulatory system and antibiotics. Arteries have a blood pressure higher than other parts of the circulatory system. Arteries form part of the circulatory system. There are other differences in respiratory and circulatory structures. Vascular surgeons focus on other parts of the circulatory system. The main impact is on the respiratory and the circulatory system. Like all nematodes, they have neither a circulatory nor a respiratory system. Large prey typically dies of blood loss or circulatory shock. This also leaves the patient with impaired muscular, nervous and circulatory development.