1. Definition: "Biology" is a general term in science that means "the study of living creatures." "Human biology" is a branch of biology that focuses specifically on the study of the structure and function of the human body and its parts and systems.
The Human Body:The structure of the human body is the basis of human biology. The most fundamental level of this structure is the cell. Cells combine to form larger structures called tissues. Those tissues combine to form organs, those organs combine to form organ systems. Finally, those organ systems combine to form the human organism.
Systems of the Human Body: The body's major systems are the skeletal, muscular, cardiovascular, digestive, respiratory,excretory (urinary), nervous, endocrine, immune, and reproductive. Each of these systems, with the exception of the reproductive system, is essential for the continuation of a functioning human body. If any system fails, the body as a whole will either fail, or it will require some form of external support in the form of medical help to keep it working.
Functions of the Human Body: Human biology is concerned with how various cells, tissues, organs, and organ systems work and work together to form the human body. This aspect of human biology is called "physiology," and it encompasses the physical and chemical processes that are necessary for the proper functioning of the body at each of its levels of organization.
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