Human blood is the most vital liquid connective tissue in our system and most important transport mechanism for the body.
Human blood carries oxygen throughout the body, by the help of circulation system efficiently (Welsh 2013).
Human blood carries along with oxygen circulates nutrients like amino acids and electrolytes, hormones and carbon dioxide through the body (Welsh 2013).
This presentation will attempt to describe the blood circulation process through heart across the body and the double circulation process.
The circulatory system comprises of two separate systems, one circulates blood and other circulates the lymph, which takes longer time than blood (Welsh 2013).
Humans have a closed circulatory system, the blood circulates bound within the intricate network of veins, arteries and capillaries.
Heart is the most important component of the blood circulatory system, that’s pumps the oxygenated blood to the body and deoxygenated blood to the lungs (Sherwood 2015).
Figure source: Sherwood 2015
The circulatory network of the human cardiovascular system consists of interconnected veins arteries and capillaries (Sherwood 2015).
The arteries into the ranch out forming the different arterioles and then capillaries, the purpose of the capillaries is to merge bringing the circulating blood to the venous system (Herman 2016).
There are two major veins, superior vena cava and inferior vena cava, both merging into the right atrium of the heart (Herman 2016).
Circulation through heart
Human heart has one atrium and one ventricle for each circulation, both having right and left chambers each (Burns 2013).
The right atrium receives deoxygenated blood and passes it to the right ventricle to be passaged to lungs for re-oxygenation and de-carbonation.
Left atrium on the other hand receives oxygenated blood from the lungs and via pulmonary vein passes it to left ventricle and is pumped across the body through the aorta (Herman 2016).
Circulation through body
Lungs is involved with the circulatory system associated with re-oxygenation of the blood, where the deoxygenated blood is removed from the body.
The two main components of this circulator passage are the pulmonary artery and the pulmonary vein (Herman 2016).
The systemic circulation that is concerned with the flow of the blood through out the rest of the body, circulated oxy-heamoglobins through the aorta to the rest of the body (Welsh 2013).
Double circulation process
Needless to say, human body is he most complex biological system, hence the molecular mechanisms will also be complex.
The cardiovascular system of the body comprises of double circulatory system, in which the blood passes twice through the heart (Burns 2013).
The blood circulation system involving double circulation is separate from the systemic circulation.
Here there are two circuits for the circulation passage, one for pulmonary circulation, and the other for the systemic circulation (Sherwood 2015).
The four chambered structure of the human heart facilitates the process of double circulation further, allowing passage related ease.
The blood pressure in case of a double circulatory system passes is spiked as the blood passes through twice (Welsh 2013).
The oxygen infused and carbon dioxide infused blood is kept separately with the heart in the two separate chambers with the help of valves.
The separate circulatory system is required so that both kinds of blood does not intermix, as depleted blood circulated though the body can starve the cells and cause early apoptosis (Herman 2016).
Helps in facilitating separate circuits for circulation of fresh and depleted blood separately.
Facilitates greater blood flow and keeps the oxygen demand of the human body satisfied, keeping the body temperature warmer (Herman 2016).
- Burns, N., 2013. Cardiovascular physiology. Retrieved from School of Medicine, Trinity College, Dublin: https://www. medicine. tcd. ie/physiology/assets/docs12_13/lecturenotes/NBurns/Trinit y% 20CVS% 20lecture.
- Herman, I.P., 2016. Cardiovascular system. In Physics of the Human Body(pp. 533-621). Springer International
- Sherwood, L., 2015. Human physiology: from cells to systems. Cengage learning.
- Welsh, J.H., 2013. Heart, circulation and blood cells. Physiology of mollusca, 2, pp.125-174.