1 / 54

Chapter 5 Tissues

Chapter 5 Tissues. Intercellular Connections . Individual cells connect to form tissues 3 ways: Tight junctions- Desmosome- adhesion between cells in spots. Allows from some permeability. Gap junctions- cytoplasms of adjacent cells are connected through transport proteins.

jetta
Télécharger la présentation

Chapter 5 Tissues

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 5Tissues

  2. Intercellular Connections • Individual cells connect to form tissues 3 ways: • Tight junctions- • Desmosome- adhesion between cells in spots. Allows from some permeability. • Gap junctions- cytoplasms of adjacent cells are connected through transport proteins. • Ions can pass freely through cells.

  3. Intercellular Connections

  4. Tissue Types A tissue is a group of cells with a common structure & function The human body is composed of four main tissue types: • 1. • 2. Connective • 3. • 4. Nerve

  5. Epithelial Tissue Epithelial Tissue

  6. Characteristics • Always has a free (apical) surface exposed to outside or open space. • Has a basement membrane to anchor underlying tissue

  7. Functions • Covers body surfaces • Protects • Absorbs • Excretes

  8. Classified by Shape • Squamous – • Cuboidal – • Columnar –

  9. Classified by Shape May occur in layers: • Simple – • Stratified – 2 or more layers • Pseudostratified– • Example – simple cuboidal • Example – stratified columnar

  10. Examples of Epithelial Tissue

  11. s Simple Squamous- Thin, flattened cells. Allow for diffusion and filtration. Line air sacs of lungs and walls of capillaries.

  12. Simple cuboidal-single layer of cube shaped cells. Lines follicles of thyroid gland, kidneys and ducts of certain glands.

  13. Simple columnar- single layer of elongated cells. Can contain cilia, used for protection and absorption in digestive tract.

  14. Stratified squamous-Layers of squamous cells. Make up epidermis and line cavities exposed to external environment.

  15. Stratified columnar- Several layers of columnar cells overlying cuboidal cells near the basement membrane.

  16. Pseudostratified ciliated columnar- Appear stratified but are not. Often contain cilia and goblet cells which secrete mucus.

  17. Pseudostratified ciliated columnarw/goblet cells- Line Respiratory passages to trap unwanted particles

  18. Transitional tissue- Changes in response to change in tension. Line urinary bladder and urethra.

  19. Glandular Epithelium • Specialized to secrete substances • Those that secrete substances into ducts that open onto a surface are • Those that secrete into tissues or bloodare

  20. Classifying Glands by Structure • Simple- • Compound- duct that does branch before secretory portion.

  21. Classifying Glands by Type of Secretions 3 types: • Small portions of cells • in secretions • No loss of cytoplasm Ex. – mammary glands in secretions • Ex. – pancreas

  22. Classifying by Secretions • Secretions w/entire cells filled w/secretory products; ex. – sebaceous (oil) glands

  23. Connective Tissue

  24. Functions • 1. connects • 2. • 3. protects • 4. • 5. fills spaces

  25. Functions • 6. stores fat • 7. • 8. protects against infection • 9. • 10.helps repair damaged tissue

  26. Characteristics • 1. Consists of cells in a matrix (intercellular material) • 2. Cells some distance apart • 3. • 4.

  27. Types of Fibers: • collagenous – composed of collagen (protein); have great tensile strength; slightly elastic; compose bones, tendons & ligaments

  28. Types of Fibers - continued • elastic – composed of elastin (protein); very elastic but weaker; compose vocal cords & air passages of lungs

  29. Types of Fibers - continued • Reticular – composed of very fine collagenous fibers.

  30. Types of Cells 1. Fixed cells – stay in one place & have stable numbers; 2 types: • fibroblasts – large & star-shaped; most prevalent

  31. Types of Cells - continued • mast cells – may release heparin (for blood clotting) & histamines (promotes allergic reactions & inflammation); usually located near blood vessel walls

  32. Types of Cells - continued 2. Wandering cells – • macrophages – (Purple cells – macrophages, Green cells – T-lymphocytes)

  33. Examples of Connective Tissue

  34. Areolar tissue-binds the skin to underlying organs and under epithelium to provide bloodflow.

  35. Adipose tissue- connective tissue composed of fats, cushion joints and provide insulation

  36. Regular dense connective- strong fibers bind body parts together. Found in ligaments and tendons.

  37. Irregular dense connective- disorganized and strong. Found in the dermis

  38. Hyaline cartilage- Most common, found on ends of bones, nose cavity and supporting rings of resp. system.

  39. Fibrocartilage- tough tissue containing collagenous fibers. Shock absorbers between vertebrae.

  40. Elastic cartilage- flexible cartilage make up ears and larynx

  41. Blood - platelets

  42. Blood – red cells & white cell

  43. Elastic connective

  44. Reticular connective

  45. Bone- A- central canal (contains blood vessels) B- Canaliculi- minute tubes allow for movement between cells.

  46. Bone- D- Lamellae (layers of osetocytes), C- osteocytes

  47. Muscle & Nerve Tissue

  48. Muscle Tissue 3 types: • Skeletal- • Used for movement • Smooth- lacks striations found in skeletal, used for involuntary movements • Ex- move food through digestive tract • Cardiac-

  49. 3 Types of Muscle Tissue

  50. Smooth muscle- B- nucleus

More Related