Types of Cells Normally Found in or on Human Bodies (Less Detailed Version)

1. prokaryotic cells

1.1. bacterial cells

1.2. archaeal cells

1.2.1. cells that tolerate unusual environments (temp, pH, solute concentration) or cells that perform an unusual type of metabolism (methane gas producers)

2. eukaryotic cells

2.1. animal cells

2.1.1. human cells

2.1.1.1. group together to form human tissues

2.1.1.1.1. connective tissue

2.1.1.1.2. nervous tissue

2.1.1.1.3. muscular tissue

2.1.1.1.4. epithelial tissue

2.1.2. other animal cells

2.1.2.1. group together to form other animal tissues, organs, and organ systems

2.2. fungal cells

2.2.1. yeast cells

2.2.2. mold cells

2.3. protist cells

2.3.1. protozoan cells

3. The Human Microbiome: Researchers are starting to argue that our normal microbes could be considered as a separate organ system with its own organs, tissues, and cells. Remember that our microbes outnumber our human cells by almost ten to one! Most of our microbes are composed of prokaryotic cells (especially bacteria) but a good number are composed of eukaryotic cells.

4. The four types of human tissues can join together in different combinations to form organs. A group of organs and tissues function together to create a system. The joining of all of your systems creates your body. "Homeostasis" is a term that is used to describe the internal balance maintained by your systems. Break down the word into its parts: "home/o" means sameness and "-stasis" means standing still.