Lesson 7 Notes Living Systems are Organized into Hierarchies - For Multicellular Organisms Early Stages of Tissue Development - Gastrulation is a process involving a complex series of cell shape changes and cell movements that occur in the blastula - Establishes the basic body plan and creates three primary germ layers o Endoderm o Mesoderm o Ectoderm Primary Germ Layers Give Rise to Cells and Tissues - Each germ layer differentiates into different cell types and tissues - Ectoderm (Outer Layer) o Epidermis of skin, lining of the oral cavity, nervous system - Mesoderm (Middle Layer) o Skeleton, muscles, circulatory system, dermis of skin, reproductive organs - Endoderm (Inner Layer) o Inner layer of digestive and respiratory system, major glands (pancreas and liver) Epithelial Tissue - Forms exterior and interior linings of organs - Functions: Protection, Secretion, Absorption, Erosion - Simple or stratified o Squamous o Cuboidal o Columnar Connective Tissue - Derived from mesoderm - Provides a framework for other tissues in organ structure - Cells in an extracellular matrix
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