EPITHELIAL TISSUE OBJECTIVES: GENERAL CHARACTERISTICS OF EPITHELIAL TISSUE TISSUE UNIT
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1 BIOLOGY II TISSUE UNIT ACTIVITY #1 NAME DATE HOUR EPITHELIAL TISSUE OBJECTIVES: 1. Identify the body s four major tissue types and their roles. (p. 82) 2. List the general characteristics of epithelial tissue. (pp and 84 85) 3. Describe the three types of cell-to-cell junctions found in epithelial tissue. (pp ) 4. Identify and give the functions and locations of the types of epithelial tissue. (pp ) GENERAL CHARACTERISTICS OF EPITHELIAL TISSUE Tissue Unit Activity #1 page 1
2 CLASSIFICATION OF EPITHELIAL TISSUE Simple Epithelium Stratified Epithelium Tissue Unit Activity #1 page 2
3 TYPES OF EPITHELIAL TISSUE Simple Squamous Epithelium Simple Cuboidal Epithelium Tissue Unit Activity #1 page 3
4 Simple Columnar Epithelium Pseudostratified Epithelium Tissue Unit Activity #1 page 4
5 Stratified Squamous Epithelium Transitional Epithelium Tissue Unit Activity #1 page 5
6 QUESTIONS: 1. Identify the type of epithelial tissue represented in each of the pictures on the tissue cards. # Type of Tissue # Type of Tissue Tissue Unit Activity #1 page 6
7 2. Match the epithelial tissue with the correct description. A. Pseudostratified columnar B. Simple columnar C. Simple cuboidal D. Simple squamous E. Stratified squamous F. Transitional Single layer of cube-shaped cells Single layer of flat cells Single layer of cells that are taller than they are wide Appear stratified; nuclei of cells at different levels; all cells contact the basement membrane Several layers of cells; cells at surface are flat; cells near basement membrane are cuboidal Seems to have many layers; layered appearance result of overcrowding; outermost cells appear rounded or cuboid 3. Match the epithelial tissue with the correct location. A. Pseudostratified columnar B. Simple columnar C. Simple cuboidal D. Simple squamous E. Stratified squamous F. Transitional Surface of the skin, lining of the mouth, throat, rectum, anus, vagina Urinary bladder, renal pelvis, ureters Nasal passages, bronchi, trachea Lining of the ventral body cavities, lining of the heart and blood vessels, portions of the kidney tubules, inner lining of the cornea, gas exchange surfaces in lungs Glands, ducts, portions of the kidney tubules, thyroid gland Lining of the stomach, intestines, gall bladder, Fallopian tubes Tissue Unit Activity #1 page 7
8 4. Match the epithelial tissue with the correct function. A. Pseudostratified columnar B. Simple columnar C. Simple cuboidal D. Simple squamous E. Stratified squamous F. Transitional Decrease friction; controls vessel permeability; absorption and secretion Limited protection; absorption; secretion Protection; absorption; secretion Protection; secretion Stretches; permits expansion and recoil after stretching Provides physical protection against abrasion, pathogens, and chemical attack 5. What is the function of the basement membrane? 6. Match the description with the correct tissue type. A. Connective Tissue B. Epithelial Tissue C. Muscle Tissue D. Nervous Tissue Covers exposed surfaces of the body and lines internal passageways and chambers Fills in internal spaces; provides structural support Contracts and provides active movement Conducts electrical impulses Major tissue found in the brain, spinal cord and peripheral nerves Major tissue found in the wall of the heart and skeletal muscles Provides physical protection; controls permeability; produces secretions Tissue Unit Activity #1 page 8
9 7. In general, what is the function of cell-to-cell junctions? 8. Match the description or example with the correct cell-to-cell junction. A. Desmosomes B. Gap Junctions C. Tight Junctions Hold two cells together by interlocking channel proteins in the cell membrane Allow small solutes to move between cells Most abundant in cardiac and smooth muscle tissue Cell membranes are fused; outermost lipid layers of adjacent cells pressed together by interlocking proteins Prevent passage of water and solutes between cells Found between epithelial cells that line the digestive tract Keep digestive enzymes, stomach acids, waste products and bacteria from seeping into body tissues and damaging the tissue Rivet cells together Very strong and can resist stretching and twisting Found between skin cells Lock two cells together by intercellular cement and network of fine proteins Tissue Unit Activity #1 page 9
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