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Overview of Anatomy and Physiology01:24

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Human anatomy is the scientific study of the body's structures. Some of these structures are very small and can only be observed and analyzed with the assistance of a microscope. Other larger structures can readily be seen, manipulated, measured, and weighed. The word "anatomy" comes from a Greek root that means "to cut apart." Human anatomy was first studied by observing the body's exterior and the wounds of soldiers and other injuries. Later, physicians were allowed to...
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Tissues01:25

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Tissues are a group of cells that share a common embryonic origin. Microscopic observation reveals that the cells in a tissue share morphological features and are arranged in an orderly pattern to perform specific functions. From an evolutionary perspective, tissues appear in more complex organisms. Although there are many types of cells in the human body, they are organized into four broad categories of tissues: epithelial, connective, muscle, and nervous. Each of these categories is...
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Cell Diversity01:13

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The concept of a cell started with microscopic observations of dead cork tissue by Robert Hooke in 1665. Hooke coined the term "cell" based on the resemblance of the small subdivisions in the cork to the rooms that monks inhabited, called cells. About ten years later, Antonie van Leeuwenhoek became the first person to observe the living and moving cells under a microscope. In the century that followed, the theory that cells represented the basic unit of life developed.
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It is convenient to consider the body's structures in terms of fundamental levels of organization that increase in complexity: subatomic particles, atoms, molecules, organelles, cells, tissues, organs, organ systems, and organisms.
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Epithelial tissues are large sheets of cells covering all of the surfaces of the body. These surfaces can be internal or external, for example, skin, airways, the digestive tract, the urinary system, and the reproductive system. Hollow organs and body cavities that do not connect to the body's exterior, including blood vessels and serous membranes, are lined by epithelial tissue known as the endothelium.
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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
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Cell and body tissue physiology.

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This review covers cell and tissue physiology, including structure, function, and life cycles. It examines altered physiology and tumorigenesis using clinical examples.

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Area of Science:

  • Cell Biology
  • Physiology
  • Pathology

Background:

  • Understanding normal cell and tissue physiology is fundamental to biological and medical sciences.
  • Physiology encompasses the study of how cells and tissues function within an organism.
  • Knowledge of physiological processes is crucial for identifying deviations that lead to disease.

Purpose of the Study:

  • To provide a foundational review of cell and tissue physiology.
  • To explore the structure, function, and life cycle of cells and tissues.
  • To contextualize the origins of cancer (tumorigenesis) through the lens of altered physiology.

Main Methods:

  • Literature review of established physiological principles.
  • Integration of basic science concepts with clinical case studies.
  • Explanatory approach to connect physiological changes with disease etiology.

Main Results:

  • Detailed overview of cellular and tissue organization and operational mechanisms.
  • Explanation of the normal physiological life cycle stages.
  • Demonstration of how physiological alterations contribute to the development of tumors.

Conclusions:

  • Normal physiology underpins tissue homeostasis and organismal health.
  • Deviations from normal physiological states are key indicators of disease processes.
  • Altered cell and tissue physiology provides a framework for understanding tumorigenesis.