The Tissue Level of Organization

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1 4 The Tissue Level of Organization PowerPoint Lecture Presentations prepared by Jason LaPres Lone Star College North Harris

2 4-1 Four Types of Tissue Tissue Are collections of cells and cell products that perform specific, limited functions Four types of tissue 1. Epithelial tissue 2. Connective tissue 3. Muscle tissue 4. Neural tissue

3 4-1 Four Types of Tissue Epithelial Tissue Covers exposed surfaces Lines internal passageways Forms glands Connective Tissue Fills internal spaces Supports other tissues Transports materials Stores energy

4 4-1 Four Types of Tissue Muscle Tissue Specialized for contraction Skeletal muscle, heart muscle, and walls of hollow organs Neural Tissue Carries electrical signals from one part of the body to another

5 4-2 Epithelial Tissue Epithelia Layers of cells covering internal or external surfaces Glands Structures that produce secretions

6 4-2 Epithelial Tissue Characteristics of Epithelia Cellularity (cell junctions) Polarity (apical and basal surfaces) Attachment (basement membrane or basal lamina) Avascularity Regeneration

7 Figure 4-1 The Polarity of Epithelial Cells Cilia Microvilli Apical surface Golgi apparatus Nucleus Mitochondria Basement membrane Basolateral surfaces

8 4-2 Epithelial Tissue Functions of Epithelial Tissue 1. Provide Physical Protection 2. Control Permeability 3. Provide Sensation 4. Produce Specialized Secretions (glandular epithelium)

9 4-2 Epithelial Tissue Maintaining the Integrity of Epithelia 1. Intercellular connections 2. Attachment to the basement membrane 3. Epithelial maintenance and repair

10 4-2 Epithelial Tissue Attachment to the Basement Membrane Clear layer (lamina lucida) Thin layer Secreted by epithelia Barrier to proteins Dense layer (lamina densa) Thick fibers Produced by connective tissue Strength and filtration

11 4-2 Epithelial Tissue Epithelial Maintenance and Repair Epithelia are replaced by division of germinative cells (stem cells) Near basement membrane

12 4-3 Classification of Epithelia Singular = Epithelium; Plural = Epithelia Classes of Epithelia 1. Based on shape Squamous epithelia thin and flat Cuboidal epithelia square shaped Columnar epithelia tall, slender rectangles 2. Based on layers Simple epithelium single layer of cells Stratified epithelium several layers of cells

13 Table 4-1 Classifying Epithelia

14 Table 4-1 Classifying Epithelia

15 4-3 Classification of Epithelia Squamous Epithelia Simple squamous epithelium Absorption and diffusion Mesothelium Lines body cavities Endothelium Lines heart and blood vessels

16 Figure 4-3a Squamous Epithelia Simple Squamous Epithelium LOCATIONS: Mesothelia lining ventral body cavities; endothelia lining heart and blood vessels; portions of kidney tubules (thin sections of nephron loops); inner lining of cornea; alveoli of lungs FUNCTIONS: Reduces friction; controls vessel permeability; performs absorption and secretion Cytoplasm Nucleus Connective tissue Lining of peritoneal cavity LM 238

17 4-3 Classification of Epithelia Squamous Epithelia Stratified squamous epithelium Protects against attacks Keratin protein adds strength and water resistance

18 Figure 4-3b Squamous Epithelia Stratified Squamous Epithelium LOCATIONS: Surface of skin; lining of mouth, throat, esophagus, rectum, anus, and vagina FUNCTIONS: Provides physical protection against abrasion, pathogens, and chemical attack Squamous superficial cells Surface of tongue Stem cells Basement membrane Connective tissue LM 310

19 4-3 Classification of Epithelia Cuboidal Epithelia Simple cuboidal epithelium Secretion and absorption Stratified cuboidal epithelia Sweat ducts and mammary ducts

20 Figure 4-4a Cuboidal and Transitional Epithelia Simple Cuboidal Epithelium LOCATIONS: Glands; ducts; portions of kidney tubules; thyroid gland FUNCTIONS: Limited protection, secretion, absorption Connective tissue Nucleus Kidney tubule Cuboidal cells Basement membrane LM 650

21 Figure 4-4b Cuboidal and Transitional Epithelia Stratified Cuboidal Epithelium LOCATIONS: Lining of some ducts (rare) FUNCTIONS: Protection, secretion, absorption Lumen of duct Stratified cuboidal cells Basement membrane Nuclei Sweat gland duct Connective tissue LM 500

22 4-3 Classification of Epithelia Transitional Epithelium Tolerates repeated cycles of stretching and recoiling and returns to its previous shape without damage Appearance changes as stretching occurs Situated in regions of the urinary system (e.g., urinary bladder)

23 Figure 4-4c Cuboidal and Transitional Epithelia Transitional Epithelium LOCATIONS: Urinary bladder; renal pelvis; ureters FUNCTIONS: Permits expansion and recoil after stretching Epithelium (relaxed) Empty bladder Basement membrane Connective tissue and smooth muscle layers LM 400 Full bladder Urinary bladder Epithelium (stretched) Basement membrane Connective tissue and smooth muscle layers LM 400 LM 400

24 4-3 Classification of Epithelia Columnar Epithelia Simple columnar epithelium Absorption and secretion Pseudostratified columnar epithelium Cilia movement Stratified columnar epithelium Protection

25 Figure 4-5a Columnar Epithelia Simple Columnar Epithelium LOCATIONS: Lining of stomach, intestine, gallbladder, uterine tubes, and collecting ducts of kidneys FUNCTIONS: Protection, secretion, absorption Microvilli Cytoplasm Nucleus Intestinal lining Basement membrane Loose connective tissue LM 350

26 Figure 4-5b Columnar Epithelia Pseudostratified Ciliated Columnar Epithelium LOCATIONS: Lining of nasal cavity, trachea, and bronchi; portions of male reproductive tract FUNCTIONS: Protection, secretion, move mucus with cilia Cilia Cytoplasm Nuclei Trachea Basement membrane Loose connective tissue LM 350

27 Figure 4-5c Columnar Epithelia Stratified Columnar Epithelium LOCATIONS: Small areas of the pharynx, epiglottis, anus, mammary glands, salivary gland ducts, and urethra FUNCTION: Protection Lumen Loose connective tissue Deeper basal cells Superficial columnar cells Lumen Cytoplasm Nuclei Salivary gland duct Basement membrane LM 175

28 4-3 Classification of Epithelia Glandular Epithelia Endocrine glands Release hormones Into interstitial fluid No ducts Exocrine glands Produce secretions Onto epithelial surfaces Through ducts

29 4-4 Connective Tissue Characteristics of Connective Tissue 1. Specialized cells 2. Solid extracellular protein fibers 3. Fluid extracellular ground substance The Extracellular Components of Connective Tissue (Fibers and Ground Substance) Make up the matrix

30 4-4 Connective Tissue Functions of Connective Tissue Establishing a structural framework for the body Transporting fluids and dissolved materials Protecting delicate organs Supporting, surrounding, and interconnecting other types of tissue Storing energy reserves, especially in the form of triglycerides Defending the body from invading microorganisms

31 4-4 Connective Tissue Classification of Connective Tissues 1. Connective tissue proper Connect and protect 2. Fluid connective tissues Transport 3. Supporting connective tissues Structural strength

32 4-4 Connective Tissue Categories of Connective Tissue Proper Loose connective tissue More ground substance, fewer fibers For example, fat (adipose tissue) Dense connective tissue More fibers, less ground substance For example, tendons

33 4-4 Connective Tissue Connective Tissue Proper Cell Populations Fibroblasts Fibrocytes Adipocytes Mesenchymal cells Mast cells Lymphocytes Microphages Melanocytes Macrophages

34 4-4 Connective Tissue Connective Tissue Fibers 1. Collagen fibers 2. Reticular fibers 3. Elastic fibers

35 4-4 Connective Tissue Collagen Fibers Most common fibers in connective tissue proper Long, straight, and unbranched Strong and flexible Resist force in one direction For example, tendons and ligaments

36 4-4 Connective Tissue Reticular Fibers Network of interwoven fibers (stroma) Strong and flexible Resist force in many directions Stabilize functional cells and structures For example, Bone marrow

37 4-4 Connective Tissue Elastic Fibers Contain elastin Branched and wavy Return to original length after stretching For example, elastic ligaments of vertebrae

38 4-4 Connective Tissue Ground Substance Is clear, colorless, and viscous Fills spaces between cells and slows pathogen movement

39 Figure 4-8 The Cells and Fibers of Connective Tissue Proper Reticular fibers Melanocyte Fixed macrophage Plasma cell Blood in vessel Mast cell Elastic fibers Free macrophage Collagen fibers Fibroblast Adipocytes (fat cells) Ground substance Mesenchymal cell Lymphocyte

40 4-4 Connective Tissue Loose Connective Tissues The packing materials of the body Three types in adults 1. Areolar 2. Adipose 3. Reticular

41 4-4 Connective Tissue Areolar Tissue Least specialized Viscous ground substance Elastic fibers Holds blood vessels and capillary beds For example, under skin (subcutaneous layer)

42 4-4 Connective Tissue Adipose Tissue Adipose cells Adipocytes in adults do not divide Expand to store fat Shrink as fats are released Mesenchymal cells divide and differentiate To produce more fat cells When more storage is needed

43 4-4 Connective Tissue Reticular Tissue Provides support Complex, three-dimensional network Supportive fibers (stroma) Support functional cells Reticular organs Spleen, liver, lymph nodes, and bone marrow

44 Figure 4-10a Adipose and Reticular Tissues Adipose Tissue LOCATIONS: Deep to the skin, especially at sides, buttocks, breasts; padding around eyes and kidneys FUNCTIONS: Provides padding and cushions shocks; insulates (reduces heat loss); stores energy Adipocytes (white adipose cells) Adipose tissue LM 300

45 Figure 4-10b Adipose and Reticular Tissues Reticular Tissue LOCATIONS: Liver, kidney, spleen, lymph nodes, and bone marrow FUNCTIONS: Provides supporting framework Reticular fibers Reticular tissue from liver Reticular Tissue LM 375

46 4-4 Connective Tissue Dense Connective Tissues Connective tissues proper, tightly packed with high numbers of collagen or elastic fibers Dense regular connective tissue Dense irregular connective tissue Elastic tissue

47 4-4 Connective Tissue Dense Regular Connective Tissue Tightly packed, parallel collagen fibers Tendons attach muscles to bones Ligaments connect bone to bone and stabilize organs

48 Figure 4-11a Dense Connective Tissues Dense Regular Connective Tissue LOCATIONS: Between skeletal muscles and skeleton (tendons and aponeuroses); between bones or stabilizing positions of internal organs (ligaments); covering skeletal muscles; deep fasciae FUNCTIONS: Provides firm attachment; conducts pull of muscles; reduces friction between muscles; stabilizes relative positions of bones Collagen fibers Fibroblast nuclei Tendon LM 440

49 4-4 Connective Tissue Dense Irregular Connective Tissue Interwoven networks of collagen fibers Layered in skin Around cartilages (perichondrium) Around bones (periosteum) Form capsules around some organs (e.g., liver, kidneys)

50 Figure 4-11b Dense Connective Tissues Dense Irregular Connective Tissue LOCATIONS: Capsules of visceral organs; periostea and perichondria; nerve and muscle sheaths; dermis FUNCTIONS: Provides strength to resist forces applied from many directions; helps prevent overexpansion of organs such as the urinary bladder Collagen fiber bundles Deep dermis LM 111

51 4-4 Connective Tissue Elastic Tissue Made of elastic fibers For example, elastic ligaments of spinal vertebrae

52 Figure 4-11c Dense Connective Tissues Elastic Tissue LOCATIONS: Between vertebrae of the spinal column (ligamentum flavum and ligamentum nuchae); ligaments supporting penis; ligaments supporting transitional epithelia; in blood vessel walls FUNCTIONS: Stabilizes positions of vertebrae and penis; cushions shocks; permits expansion and contraction of organs Elastic fibers Fibroblast nuclei Elastic ligament LM 887

53 4-4 Connective Tissue Fluid Connective Tissues Blood and lymph Watery matrix of dissolved proteins Carry specific cell types (formed elements) Formed elements of blood Red blood cells (erythrocytes) White blood cells (leukocytes) Platelets

54 4-4 Connective Tissue Fluid Elements of Connective Tissues Extracellular Plasma Interstitial fluid Lymph

55 Figure 4-12 Formed Elements of the Blood Red blood cells Red blood cells, or erythrocytes (e-rith-ro-sıts), are responsible for the transport of oxygen (and, to a lesser degree, of carbon dioxide) in the blood. Red blood cells account for roughly half the volume of whole blood and give blood its color.

56 Figure 4-12 Formed Elements of the Blood White blood cells White blood cells, or leukocytes (LOO-ko-sıts; leuko-, white), help defend the body from infection and disease. Neutrophil Eosinophil Basophil Monocytes are phagocytes similar to the free macrophages in other tissues. Lymphocytes are uncommon in the blood but they are the dominant cell type in lymph, the second type of fluid connective tissue. Eosinophils and neutrophils are phagocytes. Basophils promote inflammation much like mast cells in other connective tissues.

57 Figure 4-12 Formed Elements of the Blood Platelets Platelets are membrane-enclosed packets of cytoplasm that function in blood clotting. These cell fragments are involved in the clotting response that seals leaks in damaged or broken blood vessels.

58 4-4 Connective Tissue Lymph Extracellular fluid Collected from interstitial space Monitored by immune system Transported by lymphatic (lymphoid) system Returned to venous system

59 4-5 Supporting Connective Tissues Support Soft Tissues and Body Weight Cartilage Gel-type ground substance For shock absorption and protection Bone Calcified (made rigid by calcium salts, minerals) For weight support

60 4-5 Supporting Connective Tissues Cartilage Matrix Proteoglycans derived from chondroitin sulfates Ground substance proteins Chondrocytes (cartilage cells) surrounded by lacunae (chambers)

61 4-5 Supporting Connective Tissues Cartilage Structure No blood vessels Perichondrium Outer, fibrous layer (for strength) Inner, cellular layer (for growth and maintenance)

62 4-5 Supporting Connective Tissues Types of Cartilage 1. Hyaline cartilage 2. Elastic cartilage 3. Fibrocartilage (fibrous cartilage)

63 4-5 Supporting Connective Tissues Hyaline Cartilage Stiff, flexible support Reduces friction between bones Found in synovial joints, rib tips, sternum, and trachea Elastic Cartilage Supportive but bends easily Found in external ear and epiglottis

64 4-5 Supporting Connective Tissues Fibrocartilage (Fibrous Cartilage) Limits movement Prevents bone-to-bone contact Pads knee joints Found between pubic bones and intervertebral discs

65 Figure 4-14a Types of Cartilage Hyaline Cartilage LOCATIONS: Between tips of ribs and bones of sternum; covering bone surfaces at synovial joints; supporting larynx (voice box), trachea, and bronchi; forming part of nasal septum FUNCTIONS: Provides stiff but somewhat flexible support; reduces friction between bony surfaces Chondrocytes in lacunae Matrix Hyaline cartilage LM 500

66 Figure 4-14b Types of Cartilage Elastic Cartilage LOCATIONS: Auricle of external ear; epiglottis; auditory canal; cuneiform cartilages of larynx FUNCTIONS: Provides support, but tolerates distortion without damage and returns to original shape Chondrocyte in lacuna Elastic fibers in matrix Elastic cartilage LM 358

67 Figure 4-14c Types of Cartilage Fibrocartilage LOCATIONS: Pads within knee joint; between pubic bones of pelvis; intervertebral discs FUNCTIONS: Resists compression; prevents boneto-bone contact; limits movement Chondrocytes in lacunae Fibrous matrix Fibrocartilage LM 400

68 4-5 Supporting Connective Tissues Bone or Osseous Tissue Strong (calcified calcium salt deposits) Resists shattering (flexible collagen fibers) Bone Cells or Osteocytes Arranged around central canals within matrix Small channels through matrix (canaliculi) access blood supply Periosteum Covers bone surfaces Fibrous layer Cellular layer

69 Figure 4-15 Bone Canaliculi Osteocytes in lacunae Fibrous layer Cellular layer Periosteum Osteon Matrix Central canal Blood vessels Osteon LM 375

70 4-8 Muscle Tissue Muscle Tissue Specialized for contraction Produces all body movement Three types of muscle tissue 1. Skeletal muscle tissue Large body muscles responsible for movement 2. Cardiac muscle tissue Found only in the heart 3. Smooth muscle tissue Found in walls of hollow, contracting organs (blood vessels; urinary bladder; respiratory, digestive, and reproductive tracts)

71 4-8 Muscle Tissue Classification of Muscle Cells Striated (muscle cells with a banded appearance) Nonstriated (not banded; smooth) Muscle cells can have a single nucleus Muscle cells can be multinucleate Muscle cells can be controlled voluntarily (consciously) Muscle cells can be controlled involuntarily (automatically)

72 4-8 Muscle Tissue Skeletal Muscle Cells Long and thin Usually called muscle fibers Do not divide New fibers are produced by stem cells (myosatellite cells)

73 Figure 4-18a Muscle Tissue Skeletal Muscle Tissue Cells are long, cylindrical, striated, and multinucleate. LOCATIONS: Combined with connective tissues and neural tissue in skeletal muscles Nuclei FUNCTIONS: Moves or stabilizes the position of the skeleton; guards entrances and exits to the digestive, respiratory, and urinary tracts; generates heat; protects internal organs Skeletal muscle Muscle fiber Striations LM 180

74 4-8 Muscle Tissue Cardiac Muscle Cells Called cardiocytes Form branching networks connected at intercalated discs Regulated by pacemaker cells Smooth Muscle Cells Small and tapered Can divide and regenerate

75 Figure 4-18b Muscle Tissue Cardiac Muscle Tissue Cells are short, branched, and striated, usually with a single nucleus; cells are interconnected by intercalated discs. LOCATION: Heart FUNCTIONS: Circulates blood; maintains blood (hydrostatic) pressure Nucleus Cardiac muscle cells Intercalated discs Striations Cardiac muscle LM 450

76 Figure 4-18c Muscle Tissue Smooth Muscle Tissue Cells are short, spindle-shaped, and nonstriated, with a single, central nucleus. LOCATIONS: Found in the walls of blood vessels and in digestive, respiratory, urinary, and reproductive organs Nucleus FUNCTIONS: Moves food, urine, and reproductive tract secretions; controls diameter of respiratory passageways; regulates diameter of blood vessels Smooth muscle Smooth muscle cell LM 235

77 4-9 Neural Tissue Neural Tissue Also called nervous or nerve tissue Specialized for conducting electrical impulses Rapidly senses internal or external environment Processes information and controls responses Neural tissue is concentrated in the central nervous system Brain Spinal cord

78 4-9 Neural Tissue Two Types of Neural Cells 1. Neurons Nerve cells Perform electrical communication 2. Neuroglia Supporting cells Repair and supply nutrients to neurons

79 4-9 Neural Tissue Cell Parts of a Neuron Cell body Contains the nucleus and nucleolus Dendrites Short branches extending from the cell body Receive incoming signals Axon (nerve fiber) Long, thin extension of the cell body Carries outgoing electrical signals to their destination

80 Figure 4-19 Neural Tissue NEURONS Nuclei of neuroglia Cell body Axon NEUROGLIA (supporting cells) Maintain physical structure of tissues Repair tissue framework after injury Perform phagocytosis Provide nutrients to neurons Regulate the composition of the interstitial fluid surrounding neurons Dendrites LM 600 Nucleolus Nucleus of neuron Dendrites (contacted by other neurons) Axon (conducts information to other cells) Mitochondrion Nucleus Microfibrils and microtubules Nucleolus Contact with other cells Cell body (contains nucleus and major organelles) A representative neuron (sizes and shapes vary widely)

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