ABSTRACT
This chapter presents a panoramic view of the key organs and systems in human and animal bodies. It focuses on physical phenomena and mechanisms behind the functioning of the systems, organs, and tissues. The chapter examines the role of pressure that must be maintained by various organs in the human body for them to function properly. Since most of the human body is composed of water, one expects fluids to play a major role in functioning of the organism. William Harvey determined how blood circulates in the human body. The circulation of blood supplies food and oxygen to tissues, carries waste products from the cells, and distributes heat to equalize body temperature. The cardiovascular system consists of the heart, arteries, and veins. The arteries carry blood to the organs, muscles, and skin and the veins return it to the heart. The flow rate of the blood changes rather dramatically as the blood traverses the cardiovascular system.
