1. Cytology - the study of cells Mr. Femia Biology

2. Important scientists – Robert Hooke 1665 - Named cells after the small boxy rooms that monks live in

3. Robert Hooke He first saw and named "cells" while he was experimenting with a new instrument we now call a "microscope." Used cork slices He saw tiny box-like shapes.

4. Anton van Leeuwenhoek 1670 - First scientist to observe living cells Father of microscopy

5. Anton van Leeuwenhoek Saw life in pond water First to observe Sperm Red blood cells Gunk from teeth

6. Leeuwenhoek's microscope was very rudimentary

7. Matthias Schleiden 1830 – German Botanist All plants are made of cells "One who wishes to be a botanist or zoologist without a microscope, is at least as great a fool as one who wants to observe the heavens without a telescope”

8. Thomas Schwann 1830 - German Worked with Schleiden Discovered all animals are made of cells

9. “The Cell Theory” 1. All organisms are composed of one or more cells 2. The cell is the basic unit of organisms 3. All cells come from preexisting cells

10. Cytology – the study of cells Three basic parts of a cell 1 cytoplasm 2 nucleus 3 cell membrane

11. Two Kinds of Cells 1. Prokaryotic Cells Small Simple No nucleus Bacteria

12. Eukaryotic cells - all other cells These include protists fungi plants animals Have a nucleus Cells contain structures called organelles.

13. Prokaryotic vs. Eukaryotic

14. Plasma membrane All cells are surrounded by a plasma membrane. It separates the contents of the cell from its environment. It regulates the passage of molecules into and out of the cell.

15. Microvilli Cells that are specialized for absorption (ex: intestinal cells) have folds in the plasma membrane called microvilli that increase the surface area.

16. Pseudopodia are temporary extensions of the plasma membrane used for movement or to engulf particles. Pseudopodia can be seen in the Amoeba below.

17. Cell Wall The cell wall functions to support and protect the cell. Plants have cell walls composed of cellulose; fungi have walls composed of chitin. cellulose chitin

18. Nucleus The nuclei can be seen in the photograph of human cheek cells The largest organelle

19. Cytoplasm – the material enclosed by the plasma membrane, excluding the nucleus

20. Cilia and Flagella Hair-like structures projecting from the cell that function to move the cell by their movements. They contain cytoplasm and are enclosed by the plasma membrane.cytoplasmplasma membrane

21. Cells the basic unit of living organisms Observe and draw Prokaryotic & Eukaryotic Label Nucleus Cell membrane Cytoplasm