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人体系统科普human body systems.pdf 27页

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1 HUMAN BODY SYSTEMS INTRODUCTIONINTRODUCTION INTRODUCTION INTRODUCTIONINTRODUCTION Who are we? We can learn the answer to this question by observing, hypothesizing, experimenting, and analysing. We are complex living beings in a complex, contradictory, ever-changing world. We know that we do not understand everything about ourselves, but by using this scientific method we can keep learning more and more. Without our bodies we are nothing. A person cannot exist without a body. In this book you can see pictures of some basic structures of the human body. You can also begin to see the interconnections between the different parts of the body in order to understand how the body functions. We should warn you that there are two serious misconceptions that you may get from this book. One misconception is that any part of the human body exists in a static state. Actually everything in the body is in a constant state of movement and change. It is constantly being broken down and rebuilt. Every thing is in the process of becoming something else. Actually, we are not made of things, but of processes. Thus, on the left-hand pages, we have briefly discussed some of the processes and functions of the structures seen on the right-hand pages. The second misconception is that the human body systems exist as separate entities. They cannot function separately. They are all interconnected and dependent on each other. Some of the same organs even belong to more than one system. For example, the long bones appear in both the skeletal and the lymphatic systems, since in addition to providing support they also manufacture blood cells. The ovaries appear in both the ho

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