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Section 3-1 Discovering Cells Cells • The basic unit of structure and function of all living things. – Structure: It’s what makes every living thing. – Function: It’s what makes every living thing work. • Very small – one square centimeter of skin’s surface contains over 100,000 cells Cell Discovery • Robert Hooke – One of the first people to observe cells – Gave them the name cells because they looked like rooms • Anton van Leeuwenhoek – Looked at pond water and observed onecelled organisms he called “animalcules” – Also looked at tooth scrapings where he was the first person to see bacteria The Cell Theory • • • All living things are made of cells Cells are the basic unit of structure and function in all living things All cells are produced from other cells Unicellular and Multicellular • Unicellular – Made of one cell. • Multicellular – Made of more than one cell. – Tissue – a group of similar cells • Ex. A Bunch of Nerve Cells – Organ – a group of tissues that work together • Ex. Brain – Organ System – A group of organs that work together • Ex. Nervous System Nerve Cell Brain Nervous System