Lab:Lab:

Tissue Tissue IdentificationIdentification

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 ViewNotice the protruding nucleus

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…

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)

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

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 Cell2. nuclei 3. Intercalated Discs

http://www.mhhe.com/biosci/ap/histology_mh/skmuscls.jpg

Skeletal Muscle (Voluntary):•Contains many nuclei in one cell (multinucleated)•Clearly striated (striped)

Blood Tissue:•Red blood cells (no nucleus)

•Carry oxygen•White blood cells (large nucleus)

•Immune system•Platelets

•Help with clottingPlatelets