Class Notes (808,131)
Canada (493,086)
BIOL 1410 (94)


5 Pages
Unlock Document

University of Manitoba
Biological Sciences
BIOL 1410
Jennifer Mcleese

Cell Junctions (in some tissues)  Bind cells together  Formed by cell membrane proteins 1. Tight Junctions  Proteins on lateral surfaces/sides of cells fused together  Form ring like seal  Prevents material passing between cells 2. Anchoring Junctions  Desmosomes  Fasten cells to each other or to extracellular material (rivets) Allow tissue to change shape without tearing (ex. within skin cells)  3. Gap Junctions  Open protein channels connecting adjacent cells  Lets ions/small molecules to pass from 1 cell to another  Tissue works as unit  Cardiac and smooth muscle (synchronized contractions)  Epithelial tissue Epithelial Tissue  Covers body surface  Lines body/organ cavities (Lumen) Characteristics  1 free surface  Little extracellular space between cells (packed closely)  Avascular: No blood vessels  Basement membrane (can't see it): Extracellular layer o Attaches epithelium to underlying CT (formed by both tissues/Velcro) Classification of Epithelial Tissue  Classified in 2 ways Number of Cell Layers Simple: 1 layer o Exchange of molecules (gases, nutrients, etc.) o Absorption, secretion (lungs/kidney) Stratified: More than 1 layer o Protective (areas of wear and tear) o For stratified tissues we only look at top layers (apical layer) for cell shape Pseudo stratified = SIMPLE o Appears stratified (nuclei at different levels) o All cells sit on basement membrane o Most of respiratory tract + ciliated Cell Shape Squamous: Squished Cuboidal: Cube Columnar: Column (Tall and thin) Transitional: Cell shape (and layering) varies with stretching o Inner lining of urinary system o Cuboidal to squamous when stretched Function: Glandular  Secretion Exocrine Glands:  Secrete onto body surface or into cavity Unicellular  Goblet cells secrete mucous Multicellular  Ducts (sweat and oil glands)  Sudoriferous Endocrine Glands:  No ducts  Secretions (hormones) into blood  Thyroid gland secretes thyroid hormone Connective Tissue  Supports and connects tissue  Cells far apart separated by extracellular matrix  Variable vascularity CT Cell Types Blast: Build matrix (osteoblast) Cyte: Maintain matrix (Osteocyte) Clast: Break down matrix (osteoclast) Matrix  Extracellular material gives CT identifying characteristics Fibers (proteins)  Collagen fibers are for strength  Elastin fibers allow stretch and recoil  Reticular fibers form networks (basement membrane) Ground Substance  Unstructur
More Less

Related notes for BIOL 1410

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.