Tissues Part 1 August 31, 2016

What are these? Tissues! Left  right, top  bottom: hyaline cartilage, areolar, bone, pseudostratified columnar epithelial, adipose, smooth muscle, transitional epithelial, simple squamous epithelial, dense regular connective

Major Tissue Types & Functions Epithelial Tissue – lining, covering, & glandular Connective – protecting, supporting, and binding together Muscular – movement Nervous - control

Epithelial Tissue Epithelial tissues lines all body surfaces and cavities Functions: protection absorption filtration secretion

Epithelial Tissue Special features of epithelial tissue: Cells are tightly bound together Basal surface attached to basement membrane, apical surface is free. Avascular – no blood supply. Nutrition and gases diffuse from underlying connective tissue Excellent regenerative ability. Contain multi- and uni-potent stem cells. Basement membrane is a network of collagen fibers secreted by the epithelial cells Contain multi- and uni

Epithelial Tissue Turn & Talk: How does each special feature relate to the functions of epithelial tissue? - 2 min Basement membrane is a network of collagen fibers secreted by the epithelial cells Contain multi- and uni

Epithelial Tissue Basic Shapes Basement membrane is a network of collagen fibers secreted by the epithelial cells Contain multi- and uni

Classification of Epithelial Tissues Simple squamous epithelium A single layer of thin cells, specializing in rapid diffusion and filtration Found in: alveoli of lungs, walls of capillaries, kidney glomeruli, and serosae

Classification of Epithelial Tissues Simple squamous epithelium A single layer of thin cells, specializing in rapid diffusion and filtration Found in: alveoli of lungs, walls of capillaries, kidney glomeruli, and serosae Picture of alveoli of lungs.

Classification of Epithelial Tissues Simple cuboidal epithelium A single layer of cube- shaped cells Found in: glands, kidney tubules, ovaries Kidney tubules

Classification of Epithelial Tissues Simple columnar epithelium A single layer of tall shaped cells Often contain mucus- producing Goblet cells and / or cilia Found in: digestive tract (unciliated), bronchi (ciliated), and uterine tubes (ciliated) Small intestine

Classification of Epithelial Tissues Simple columnar epithelium A single layer of tall shaped cells Often contain mucus- producing Goblet cells and / or cilia Found in: digestive tract (unciliated), bronchi (ciliated), and uterine tubes (ciliated) Uterine tube

Classification of Epithelial Tissues Pseudostratified columnar epithelium A single layer of cells that differ in length. Often contain cilia and Goblet cells Found in: respiratory tract trachea

Classification of Epithelial Tissues Pseudostratified columnar epithelium A single layer of cells that differ in length. Often contain cilia and Goblet cells Found in: respiratory tract Notice that the nuclei appear at different levels. For our purposes: nuclei at different levels + cilia = pseudostratified columnar epithelia trachea

Classification of Epithelial Tissues Stratified Squamous Epithelium Multiple layers of epithelial tissue. Flattened and atrophied (‘dead’) at the apical edge; but can be rounder at basal edge. Apical edge sloughs off and is replaced. Function: protection from wear & tear Found in skin, mouth, esophagus Esophagus?

Classification of Epithelial Tissues Transitional epithelium Cells can change shape, allowing the tissue to stretch. Apical cells appear round when tissue is relaxed, and flat with tissue is stretched. Found in urinary tract. Ureter tube

Classification of Epithelial Tissues Transitional epithelium Cells can change shape, allowing the tissue to stretch. Apical cells appear round when tissue is relaxed, and flat with tissue is stretched. Found in urinary tract. Notice that the cells look rounded and irregular. Ureter tube

Quick Review: Epithelia Tissue Show with fingers: Simple squamous Simple cuboidal Simple columnar Stratified squamous Transitional

Quick Review: Epithelia Tissue Show with fingers: Simple squamous Simple cuboidal Simple columnar Stratified squamous Transitional Notice the cube-like shapes, and single layers separated by basement membrane

Quick Review: Epithelia Tissue Show with fingers: Simple squamous Simple cuboidal Simple columnar Stratified squamous Transitional

Quick Review: Epithelia Tissue Show with fingers: Simple squamous Simple cuboidal Simple columnar Stratified squamous Transitional Notice the many layers, and how the cells gradually become flatter

Quick Review: Epithelia Tissue Show with fingers: Pseudostratified columnar Simple cuboidal Simple columnar Stratified squamous Transitional

Quick Review: Epithelia Tissue Show with fingers: Pseudostratified columnar Simple cuboidal Simple columnar Stratified squamous Transitional Notice multiple layers, cells rounded and irregular

Quick Review: Epithelia Tissue Show with fingers: Pseudostratified columnar Simple cuboidal Simple columnar Stratified squamous Transitional

Quick Review: Epithelia Tissue Show with fingers: Pseudostratified columnar Simple cuboidal Simple columnar Stratified squamous Transitional Notice the nuclei at different levels, and the cilia

Exit Ticket: These are some slides from the beginning of class … can you name them now? Left  right, top  bottom: hyaline cartilage, areolar, bone, pseudostratified columnar epithelial, adipose, smooth muscle, transitional epithelial, simple squamous epithelial, dense regular connective