In the world of living organisms, humans have developed the most sophisticated systems and therefore human beings are the most advanced species living on earth. The human body is essentially one integrated unit that consists of millions of cells and functioning systems that keep life processes going.
As we learn in the study of anatomy and physiology, there are fundamentally four specific major functioning systems that provide humans with a uniqueness that is not replicated anywhere else on this planet.
1. Human cells are known to be the simplest parts of all living matter. As small as cells are, cells have the incredible ability to sustain life and reproduce new cells.
As we all learn in Biology 101 in high school, human cells begin their existence as a single fertilized cell. After being given life through fertilization, human cells have a great capacity to duplicate.
2. Human tissue is a much more sophisticated system than cells are. Actually tissue is a group of a large number of like cells that perform specific functions in the body.
3. Organs in the human body are substantially more complicated functioning units than even systems such as tissues. Organs are a collection of many different types of tissues. The purpose of organs is to support the body by performing a wide variety of special functions needed to sustain life.
The heart is an example of an organ in the body. The heart is an essential organ that pumps blood to and from the body.
4. Systems are considered the most complex of the functioning units in the body. A system is made up of group of organs for the purpose of performing essential functions in the body.
The circulatory system is an example of a system in the body. The circulatory system’s main function is to transport blood to all parts of the body.
Physiological functions in the body are essential to sustaining living organisms like humans. The body’s sophisticated functions are ultimately built upon the complex arrangement of human cells.
Similar cells are grouped together to form more complex systems like tissues. Tissues are then group to function in evermore complex operations such as organs. Organs are group together to function in systems.
All of these mechanisms are needed to sustain human organisms, which are the most complex organisms on the planet.