Cell Specialization in Animals Learning Goals I can describe cloning and stem cell research and explain why they are controversial. Cell Specialization in Animals During early development of living organisms, cell differentiation occurs during which specialized cells form. Cell Specialization Definition the process by which cells develop from similar cells into cells that have specific functions within a multicellular organism. Note: Unspecialized cells that can produce various specialized cells are called: stem cells What Factors Influence Cell Specialization in Animals? Content of cytoplasm 2. Environmental conditions 3. Influence of neighbouring cells 1. Note: Environmental factors such as chemical contaminants and disease-causing agents may lead to abnormal development. Levels of Organization in the Human Body Cells Tissues Organs Organ Systems Organism Smallest Largest Unit Unit What is a Tissue? Definition: A group of cells that perform a specific type of function. Four main types of tissue: Epithelial Muscle Connective Nervous Types of Tissues (Source - http://www.bio.miami.edu/~cmallery/150/physiol/sf38x5.jpg) Success Criteria I can describe the 4 main types of tissues.