atoms combine to form molecules i.e. CO2 H20. Four classes of molecules found in the body: 1. Carbohydrates (sugars) 2. Lipids (fats) 3. Proteins (DNA & RNA) 4. Nucleic acids (DNA & RNA)
Cells and their functional subunits (cellular organelles) Cells are the smallest living thing in the human body *Smooth muscle cell
A group of cells that work together to perform a similar function (tissue) 4 tissue types make up all organs of the human body: 1. Epithelial tissue (epithelium) 2. Connective tissue 3. Muscle tissue 4. Nervous tissue *smooth muscle tissues
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