The cardiovascular system transports: oxygen from the atmosphere to the cells via the respiratory system, metabolic wastes such as carbon dioxide from the, tissue environment, cells to the atmosphere via the respiratory system, nutrients from the external environment to the cells via the digestive system, and lastly hormones from the endocrine system to the specific targets for communication, regulation and growth.
protection
The blood is made up of several components, which include cells / molecules from the immune system such as white blood cells (WBC), antibodies, complement proteins, to list a few. They patrol the circulatory system for foreign microbial invaders and/or toxins and extravasate (leave circulation) into the affected tissue site/(s), to mount an immune defense against it, if one is found. they also protect the integrity of our bodies by repairing damage from an injury like a cut or bruise, through the clotting mechanisms, and the following, immune mediated, tissue repair/remodeling systems.
regulation
The cardiovascular system also regulates homeostasis. Body temperature (nervous and endocrine involvement), pH (nervous and endocrine involvement), and water content (nervous and endocrine involvement) are all regulated in part by the cardiovascular system. If you are feeling very cold you may notice your extremities going cold too. Here your cardiovascular system is vasoconstricting distal arterioles to redirect blood to your core to maintain core body temperature. Cellular respiration uses glucose and oxygen to produce energy primarily in the form ATP. Carbon dioxide is a waste byproduct of cellular respiration. Carbon dioxide forms carbonic acid (an acid) in the presence of water. Carbonic acid then looses a hydrogen and forms bicarbonate (hydrocarbonate). This helps signal hemoglobin to offload oxygen in the tissues where carbon dioxide production is the highest. The release of H+ ions increases the pH of the blood, and signals to the brain to increase the rate of respiration through pH receptors in the blood vessels. Water is also a waste byproduct of cellular respiration. the cardiovascular system along with the nervous, digestve,