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Physiology of human body on earth

Human physiology is the science of the mechanical, physical, and biochemical functions

of humans in good health, their organs, and the cells of which they are composed. The principal level of focus of physiology is at the level of organs and systems. Most aspects

of human physiology are closely homologous to corresponding aspects of animal physiology, and animal experimentation has provided much of the foundation of 

 physiological knowledge.The biological basis of the study of physiology, integrationrefers to the overlap of many functions of the systems of the human body, as well as its

accompanied form. It is achieved through communication which occurs in a variety of 

ways, both electrically as well as chemically.

• The concentration of ions in relations to one another (e.g. Na+, K +, H+) determinethe body's pH, which is closely regulated by the respiratory and urinary systems.

• Temperature in the body is determined by both the external environment of the

organism as well as the amount of heat produced by anabolic reactions within the

 body regulated by respiratory and cardiovascular systems• Fluid volume and pressure, and osmolarity are regulated by the urinary,

cardiovascular, and respiratory systems.

LEVELS OF FUNCTION

Function in the human body occurs at three general levels:

a. Molecular. The basic functional entity is the molecule. The structure and interaction

of the molecules of the body is the subject of the science of biochemistry.

 b. Cellular. The individual cell is the basis of the structure and function of the human body. The individual human body consists of great numbers of these cells workingtogether as a total organism. Groups of like cells performing a common function are

called tissues. Different tissues collected together form individual organs. Groups of 

organs performing an overall function are called organ systems, for example, thedigestive system, the respiratory system, etc. When these systems are together in a single

individual, we refer to that individual as an organism. The cellular level of function is the

 primary subject matter of physiology.

c. Regional. Here, individual parts of the human body (made up of specific organs) perform activities as a unit. For example, the hand serves as a grasping, tool-holding

apparatus. The study of this level of function is called functional anatomy.

 

LAWS OF NATURE

The Universe has a fundamental order. The Universe is governed by discrete and preciselaws of nature. These laws are universal, unchangeable, and omnipresent. The human

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