chapter 1: AN INTRODUCTION TO THE HUMAN BODY

chapter 1: AN INTRODUCTION TO THE HUMAN BODY - Term...

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Term: SIX LEVELS OF STRUCTURAL ORGANIZATION IN THE HUMAN BODY Definition: 1. Chemical level 2. Cellular level 3. Tissue level 4. Organ Level 5. System Level 6. Organismic level Term: A. CHEMICAL LEVEL Definition: First level of structural organization. 1. Four essential atoms in the body: a. Carbon b. Hydrogen c. Oxygen d. Nitrogen 2. Atoms combine to form molecules: a. Proteins b. Carbohydrates c. Fats Term: B. CELLULAR LEVEL Definition: Second level of structural organization. 1. CELLS : Smallest living unit. Are the basic structural and functional units of living organisms. 2. CELLS important because they contain organelles such as the nucleus, mitochondria and rough endoplasmic reticulum, that perform specific functions within the cell that support and sustain life.
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Term: C. TISSUE LEVEL Definition: Third level of structural organization. 1. TISSUES : Group of cells and the materials surrounding them, that work together to perform a particular function. Tissues arise from three embryonic organs known as the ECTODERM, MESODERM, and ENDODERM.
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