1. Lab: Tissue Identification

2. Epithelial Tissues: Cover internal and external surfaces Simple Squamous Epithelium: Large, thin cells with “bulging” nucleus Look like sunny-side-up fried eggs http://www.uoguelph.ca/zoology/devobio/210labs/epithelial1.html Top View Side View Notice the protruding nucleus

3. Simple Cuboidal Epithelium: Almost square in cross section Edges aren’t apparent, but nuclei (stained purple in this photo) are prominent Thicker than simple squamous Simple Cuboidal Cells surrounding a duct http://www.uoguelph.ca/zoology/devobio/210labs/epithelial1.html Squamous cells, also on this slide…

4. Pseudostratified Columnar Ciliated Epithelium: Columnar= tall, vertical cells Stratified = nuclei are at approximately the same height (NOT what we’re looking at…) Pseudostratified = nuclei are at differing heights faculty.une.edu/com/abell/histo/Histolab4ab.htm Ciliated = has cilia (microscopic hairs)

5. Muscle Tissues: 3 types: Skeletal, Smooth, and Cardiac Smooth Muscle (Involuntary): Forms neat, parallel lines Features long, narrow "spindle" shaped cells with a single central, somewhat elongated, nucleus. No striations (see next two slides for comparison) http://www.uoguelph.ca/zoology/devobio/210labs/muscle1.html Smooth muscle here Not here

6. Cardiac Muscle (Involuntary): Intermediate between smooth and skeletal Faintly striated, multinucleated (more than one nucleus in a cell) Its cells branch and are joined to one another via intercalated discs http://www.uoguelph.ca/zoology/devobio/210labs/muscle1.html 1. Cardiac Muscle Cell 2. nuclei 3. Intercalated Discs

7. http://www.mhhe.com/biosci/ap/histology_mh/skmuscls.jpg Skeletal Muscle (Voluntary): Contains many nuclei in one cell (multinucleated) Clearly striated (striped)

8. Blood Tissue: Red blood cells (no nucleus) Carry oxygen White blood cells (large nucleus) Immune system Platelets Help with clotting Platelets