The body is made up of several systems. Digestive, respiratory, and circulatory systems are just among them. Digestion, respiration and circulation respectively are the processes undergoing in human body involved with these systems. Each has its own unique process to follow and each has its own substance to process before it can be used by the body tissues. The three processes are also interrelated to each other as one cannot stand alone.
Process of Digestion
Digestion is the breakdown of foods physically and chemically into its absorbable state. It starts in the mouth passes into the esophagus and propelled into the stomach
where it is processed by gastric secretions. The completion of digestion takes place in the small intestines (Stein & Miller, 2000).Process of Respiration
Respiration involves the lungs where oxygen from the environment passes through the alveoli of the lungs into the pulmonary capillaries for gas exchange. It is circulated to the peripheral capillaries in the organs and finally in the cells through the tissue capillaries.
Process of Circulation
Blood circulation starts when blood enters the vena cava of right atrium and push into the right ventricle as the heart muscles contract. From the right ventricle blood enters the lungs via the pulmonary artery leading to it where blood is cleansed from all impurities and goes back to the left side of the heart via the pulmonary veins. It enters the left atrium and pushed to the left ventricle to be distributed to all parts of the body via the aorta (Thibodeau, & Patton, 2003).
Interrelations of the three systems
The three systems of the body are interrelated in a way that all undergoes a process. Before food is utilized by the body, it has to undergo changes within some organs involved. Food cannot be utilized by the body directly without it being processed. In like manner that before oxygen and blood is used by the cells of the body. They have to undergo changes too.
Another point of relation is that Food, oxygen, and blood are all important substances that make life possible. Without the three substances a person cannot live. Each three are also dependent to each other. For example, even if you have blood circulating in your body and clean air to breath if you do not have food, the cells of the respiratory and circulatory systems will not function normally to do their job as in processing the oxygen and blood to sustain life of an individual without food to give them energy and nutrients they needed. Eventually cells may slowly die if the absence of food for many days persists.
Although digestion, respiration, and circulation have their own functions to do in the body, they have one objective that is to make life possible. Each is dependent to each other. One cannot stand alone and is not a separate part of the body.
