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The cardiovascular system incorporates the heart blood vessels and lymphatic vessels. The main purpose is to maintain adequate blood circulation and hence the distribution of nutrients to tissues and the delivery of metabolic wastes to excretory/urinary organs. There are many ways to ensure you are maintaining adequate blood circulation. For an example, you can take your pulse to monitor your heart rate. When taking your pulse it is extremely important to use the appropriate fingers to do so. Don’t take your pulse with your thumb; the thumb has a major artery which contributes to its own pulse. If you use your thumb, you won’t receive accurate results. The endocrine and immune systems also use the blood circulation as conduits for hormones, immune cells, cytokines and other chemical messengers that work at distant sites in the body.