The cardiovascular system and the lymphatic system collectively make up the circulatory system. The lymph, lymph nodes, and lymph vessels form the lymphatic system. The blood, heart, and blood vessels form the cardiovascular system. Two types of fluids move through the circulatory system: blood and lymph. Also, the digestive system works with the circulatory system to provide the nutrients the system needs to keep the heart pumping. An average adult contains five to six quarts (roughly 4.7 to 5.7 litres) of blood, which consists of plasma, red blood cells, white blood cells, and platelets. The circulatory system includes: the pulmonary circulation, a "loop" through the lungs where blood is oxygenated and the systemic circulation, a "loop" through the rest of the body to provide oxygenated blood. The main components of the human circulatory system are the heart, the blood, and the blood vessels. The lymphatic system, on the other hand, is an open system. The most primitive animal phyla lack circulatory system. While humans, as well as other vertebrates, have a closed cardiovascular system (meaning that the blood never leaves the network of arteries, veins and capillaries), some invertebrate groups have an open cardiovascular system. This system may be seen strictly as a blood distribution network, but some consider the circulatory system as composed of the cardiovascular system, which distributes blood, and the lymphatic system, which distributes lymph. Red indicates oxygenated blood, blue indicates deoxygenated.īlood circulation occurs in the circulatory system is an organ system that transports nutrients and waste to and from cells to help fight diseases and help stabilizes body temperature and pH to maintain homeostasis.
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