HIERARCHY OF ORGANIZATION
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Q: List the levels of organization in animals (smallest → largest).
A: Chemical → cellular → tissue → organ → organ system → organism.
Q: What is a tissue?
A: A group of similar cells performing a specific function.
Q: What is epithelial tissue?
A: Tightly packed cells that cover surfaces and protect from dehydration.
Q: What is connective tissue?
A:Connective tissue supports, protects, and holds body parts together.
Q: What is muscle tissue?
A: Long fibers that contract for movement.
Q: What is nerve tissue?
A: Cells that transmit electrical impulses.
Q: What is an organ?
A: A structure made of several tissues working together.
Q: What is an organ system?
A: A group of organs performing major body functions.
CHEMICAL LEVEL
lowest level of organization includes atoms and molecules (essential in maintaining life)
CELLULAR LEVEL
Cell-basic unit of life NOTE: several kinds of cells in the body, each has different structures and different functions.
ORGAN LEVEL
different types of tissue combine together and form organs. NOTE: organ composed of different types of tissue having specific functions and shape.