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Anp Ch 4 Part A
Chapter 4 part A
Term | Definition |
---|---|
Tissue | Groups of cells similar in structure that preform common or related function. |
Histology | Study of Tissues |
Tissue types | Epithelial, connective, muscle and nervous |
Nervous Tissues | Internal Communication. Brain, Spinal cord and Nerves |
Connective Tissues | Supports, protects and binds other tissues together. Bones, Tendons and Fat |
Muscle Tissues | Contracts to cause movement. Heart, walls of organs and muscles around bones |
Epithelial Tissues | Forms boundaries between different environments, protects, secrets, absorbs, and filters. Skin surface and lining of digestive tract. |
Fixed | tissue is preserved with solvent |
Sectioned | cut into slices thin enough to transmit light or electrons |
Stained | to enhance contrast |
Functions of Epithelial Tissue | protection, absorption, filtration, excretion, secretion and sensory reception. |
Forms of Epithelial Tissue | Covering and lining and Glandular |
Covering and Lining Epithelia | on external and internal surfaces ex: skin |
Glandular Epithelia | Secretory tissue in glands ex: salivary glands |
Characteristics of Epithelial tissues | Polarity, Specialized contacts, supported by connective tissues, avascular and Regeneration. |
Polarity | Has a top and bottom Apical Surface and Basal Surface |
Apical Surface | upper free side is exposed to surface or cavity |
Basal Surface | lower attached side faces inwards toward body |
Specialized Contacts | need to fit closley together like sheets. |
Connective Tissue Support | Reticular Lamina and Basement Membrane |
Reticular Lamina | Deep to basal lamina and consist of network of collagen fibers |
Basement Membrane | Made up of basal and reticular lamina |
Metastasis | spread of cancer |
Avascular | no blood vessels are found in epithelial tissue |
Regeneration | Epithelial cells have high regeneration capacities. |
Simple Epithelia | are single layer thick |
Stratified Epithelia | are two or more layers thick and involve protection. |
Squamous | flattened and scale like. squished flat top |
Cuboldal | Box like, cube |
Columnar | Tall, column like |
Simple Squamous Epithelium | 1 layer, found in kidney and lungs. |
Endothelium | Lining of lymphatic vessels, blood vessels and heart. |
Mesothelium | Serous membranes in the ventral body cavity. |
Simple Cuboidal Epithelium | Involved in secretion and absorption. Forms walls of smallest ducts of glands. Squishy middle. |
Simple Columnar Epithelium | Tall, closely packed cells. found in the digestive tract and gallbladder, |
Pseudostratified Columnar Epithelium | Vary in height and appear to be multi layered and stratified. Many cells are Ciliated. Mostly in upper respiratory tract. |
Stratified Epithelial Tissues | 2 or more layers of cells. External skin. Mucus membrane mouth to anus and vagina |
Stratified Squamous Epithelium | Most widespread of stratified epithelia. High wear and tear. Keratinized cells found in skin. |
Stratified Cuboidal Epithelium | Quite rare. Sweat and mammary glands |
Stratified Columnar Epithelium | Also very limited distribution in body. |
Transitional Epithelium | Forms lining of hollow nary organs. Bladder ureters and urethra. Sun flower looking |
Gland | one or more cells that makes and secretes and aqueous fluid called secretion. |
Endocrine Glands | Internally secreting, Ductless glands, secrete hormones |
Exocrine Glands | Externally Secreting. Secretions are released on to body surfaces such as skin. Have ducts. |
Unicellular Exocrine Glands | Found in epithelial linings of intestinal and respiratory tracts. Mucous cells and Goblet cells. |
Multi-cellular Exocrine Glands | are composed of a duct and secretory unit. Sweat and oil glands. |
Tubular Gland | secretory cells from a duct |
Aveolar glands | secretory cells from sacs. |
Merocrine | watery secretions like sweat and pancreas |
Holocrine | Dumps cell out and thicker like sebaceous oil glands |
Apocrine | glands activated during puberty. found in auxiliary and groin. |