text: where does a red blood cell goes on its journey around the human body? red blood cell human body journey circulatory system heart arteries veins human blood never rests. it never stops cleansing and feeding each cell in the body from the moment we are born until we die. each cell is bathed in this cleansing stream throughout its entire life span, and owes its moment-to-moment existence to this never ending supply stream. in the physical body the blood uses a process of exchange to accomplish its work. it goes like this: a red blood cell travels through the lungs until it reaches a very thin membrane which separates the blood from the air moving through the lung. this membrane is so thin that the red blood cell can absorb oxygen from the air through it. the hemoglobin in the red blood cell latches on to the oxygen and holds it for the long journey to the various parts of the body. at this same time the red blood cell is releasing its load of carbon dioxide through the membrane out into the lung to be exhaled. the red blood cell never stops during this process. this process happens while it is moving through the very small vessels in the lung, being pushed along by the force of contraction of the heart beat. the creator made sure that there would be enough time for all the red blood cells to complete their exchange before they leave the lungs.  once they leave the lungs, they travel to every organ, tissue and system in the body, making sure that each cell has its needs met at all times. the path that the red blood cell takes after it leaves the lungs appears to be random, but each red blood cell is guided by the creator so that each cell in the body can receive its full nourishment of oxygen and can also release its load of carbon dioxide to the red blood cell, so it can be transported back to the lungs to be exhaled. if this nourishing stream ever stops, then the level of carbon dioxide quickly builds up to poisonous levels in the cells.   now, let me pose what sounds like a silly question. what would happen if the body tissues wanted to hang on to their carbon dioxide and not go through the process of exchange with the blood.? the answer to this question is so obvious that it appears absurd. the body tissues would die and death of the entire body would soon follow. it is obvious what would happen in the human body if any of the body parts refused to allow this exchange through the blood. now let me ask the same question of the body of christ. what happens when a believer refuses to give up his sin to the cleansing power of the blood? what would happen if he stubbornly refused to release his sin and let the blood cleanse and renew him? he would loose the only provision god has made for cleansing from sin. nothing else in the world can substitute for the cleansing power of the blood of christ. if a sinner refuses to release his sin and be cleansed by the blood then he stays in spiritual death.   in the human blood each cell must release its toxins to the cleansing power of the blood. in the body of christ each believer must release his or her own personal sin to the cleansing power of christ's blood. in return, he receives not just cleansing, but eternal life, deeper sanctification, and the very presence of jesus within. who would not want such an exchange? anyone foolish enough to want to retain his sin and refuse the exchange of the blood is a fool indeed.