Monday, March 8, 2010

Blood Vessels

Blood should be distributed through the body in a way that satisfies the needs of all body organs and tissues for provision of oxygen and nutrients. As a result, once the blood gets oxygenated in the pulmonary system, it enters the heart to be pumped into a network of blood vessels with different characteristics.

An artery directly supplies an organ and then divides into smaller arteries called Arterioles. These arterioles divide in turn into smaller and thinner vessels called Capillaries, which supply with blood and nutrients to cells and participate in blood exchange at the level of the organs. Capillaries the join together to give rise to big vessels called Venules. The Venules join to form veins, which direct blood in a backward fashion, from the tissues and organs back to the heart.





Source: Medical Management of vascular conditions
http://nyp.org/health/cardiac-manage.html




Dynamics of Circulation

Circulation refers to the continuous flow of liquids that make up the body system. Blood circulates in a closed system. The human body accounts of two types of circulatory systems. The Pulmonary Circulation, which is responsible of oxygenating blood and getting rid of the carbon dioxide. In this circulatory network, blood flows from the pulmonary artery into the lungs then back through the pulmonary veins into the heart. The Systemic Circulation supplies every organ with nutrients and oxygen and carries away waste products. This circulatory system consists of the aorta and the two venae cavae. Together the Pulmonary and Systemic circulation constitute the human body blood circuit.





Source: Patterns in Assistive Technology Training and Services
http://webschoolsolutions.com/patts/systems/heart.htm



Arteries of the systemic circulation contain blood rich in which component?






Reference

Lebdeh, D., Dakroub, R., Seif, N., & Jarjour, Z. (2000). Life and Earth Sciences. Sin-El-Fil, Lebanon: Lebanese Educational Publishing Company.

3 comments:

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