Cells are specialized for particular functions Tissues
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1 Histology
2 Body Tissues Cells are specialized for particular functions Tissues Groups of cells with similar structure and function Extracellular Matrix cell glue between cells Histology study of tissue
3 Body Tissues Four primary types (functional categories) Epithelium protection /secretion /absorption/ filtration Connective support & structure Nervous communication & control Muscle movement (internal & external)
4 Primary Germ Layers Endoderm (Epithelial) Digestive & respiratory epithelium Mesoderm (Epithelial, Muscle, Connective) Muscles Ectoderm (Epithelial, Nervous) Epidermis Urethra epithelium Skeleton (bones & cartilage) Lining of mouth, anus, nostrils Bladder Blood Sweat & sebaceous glands Liver & pancreas Blood vessel epithelium Hair Dermis Excretory & reproductive organs Brain & spinal cord Eyes, nose, ear epithelium
5 EPITHELIAL TISSUES
6 Epithelial Functions Protection Sensory Secretion Absorption Excretion
7 Epithelium Characteristics High cellularity cells fit closely together very little EC matrix Contains specialized contacts tight junctions & desmosomes Avascular no blood vessels within it diffusion provides nutrients & carries waste away lots of nerve fibers Reinforcement & connection Defines boundaries cancer causes a breach in these boundaries Regenerate easily if well nourished Found in areas of high friction
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10 Classification of Epithelium Combination of shape & # of cells is used to name tissues Shape of cells Squamous flattened Cuboidal cube-shaped Columnar column-like
11 Classification of Epithelium Number of cell layers Simple one layer found in areas of transport Stratified more than one layer High abrasion areas for protection Secretory membranes
12 Classification of Epithelium Pseudostratified False layers Ciliated (respiratory tract) Non-ciliated (male urethra) Transitional multiple layers of epithelial cells, hodge-podge Found in urinary tract can look cuboidal until bladder stretches, then looks squamos
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14 Keratinized Epithelium Keratin tough waterproof material found in upper layers of some stratified squamos epithelium
15 Non-Keratinized Epithelium
16 Epithelial Membranes Mucous membranes Line body cavities OPEN to the exterior Example: digestive, respiratory, urogenital Mucus protects by trapping microorganisms, substances in mucus will destroy them Cutaneous Membranes Skin Helps waterproof & protect body First line of defense in immune system Serous Membranes Lines all CLOSED body cavities Serous fluid located between layers to reduce friction due to organ motion
17 Epithelial Membranes
18 Glandular Epithelium Gland one or more cells that secretes a particular product Two major gland types Endocrine gland Ductless secretes product directly into blood or tissue Produces hormones Exocrine gland Empty through ducts to the epithelial surface Include sweat and oil glands
19 Glandular Epithelium Apocrine secrete their product from intact cells Ex: Mammary glands Holocrine entire cells and their secretions accumulate as the gland s secretory product cells rupture Ex: Sebaceous (oil) glands Merocrine Most common accumulate their secretory product at the apical surface of each cell, which then separates from the remainder to form a secretion in the lumen of the gland. cells then repair themselves. Ex: Salivary glands
20 Glandular Epithelium
21 Connective Tissue Support & strengthen & provide structure
22 Connective Tissue Found everywhere in the body Includes the most abundant and widely distributed tissues Functions Binds body tissues together Supports the body Provides protection Insulates to maintain body temperature Transportation of other molecules
23 Origin of Connective Tissue Mesenchyme: embryonic tissue that differentiates into all forms of CT
24 Connective Tissue Characteristics Variations in blood supply Some tissue types are well vascularized Adipose danger of hemorrhage with liposuction Some have poor blood supply or are avascular Blood supply is necessary for healing brings oxygen & spare parts
25 Extracellular Matrix Two main elements Ground substance proteins and polysaccharide molecules function as a molecular sieve to diffuse nutrients & other substances Fibers Produced by the cells Three types Collagen fibers tensile strength Elastic fibers stretch with recoil Reticular fibers - support
26 Connective Tissue Cells Prefixes Fibro Osteo Chondro Hemo(cyto) Suffixes Blast build the cells Cyte cell Clast breakdown the cells
27 Connective Membranes Synovial Lines spaces between bone and joint Secrete synovial fluid to reduce friction
28 Connective Tissue Outline Bone Cartilage Hyaline Fibrocartilage Elastic Perichondrium Fibrous Areolar (Loose connective) Adipose Reticular Dense fibrous Regular Irregular Blood Plasma Cells Eryhtrocytes Leukocytes Thrombocytes
29 Connective Tissue Types - BONE Bone (osseous tissue) Composed of: Bone cells in lacunae (cavities) Hard matrix of calcium salts Large numbers of collagen fibers Osteon primary anatomical and functional unit of compact bone Used to protect and support the body Hematopoiesis formation of blood cells
30 Connective Tissue Types - CARTILAGE Hyaline cartilage Most common cartilage Composed of: Abundant collagen fibers Rubbery matrix Avascular Found in Entire fetal skeleton Ventral ends of ribs Articular surface of bones
31 Connective Tissue Types - CARTILAGE Fibrocartilage Highly compressible Strongest & most durable forms cushion-like discs between vertebrae, pubic symphysis, meniscus
32 Connective Tissue Types - CARTILAGE Elastic cartilage Provides elasticity, very flexible Supports the external ear, larynx
33 Connective Tissue Types - CARTILAGE Perichondrium Surrounds cartilage
34 Connective Tissue Types - FIBROUS Areolar (Loose Connective) Most widely distributed connective tissue (surrounds blood vessels & nerves) Soft, pliable tissue Contains all fiber types Can soak up excess fluid Main function to cushion and protect organs Types of fibers Collagenous - collagen Elastic elastin, stretchable Reticular very thin
35 Connective Tissue Types - FIBROUS Adipose Matrix is an areolar tissue in which fat globules predominate Many cells contain large lipid deposits Functions Insulates the body Protects some organs Serves as a site of fuel storage
36 Connective Tissue Types - FIBROUS Adipose
37 Connective Tissue Types - FIBROUS Reticular Delicate network of interwoven fibers Holds together adipose tissue Forms stroma (internal supporting network) of lymphoid organs; soft skeleton Lymph nodes Spleen Bone marrow
38 Connective Tissue Types - FIBROUS Dense fibrous Main matrix element is collagen fibers Cells are fibroblasts Irregular not parallel dermis Regular - parallel Tendons attach muscle to bone Ligaments attach bone to bone Regular Irregular
39 Connective Tissue Types - FIBROUS
40 Connective Tissue Types - BLOOD Fibers are visible during clotting Functions as the transport vehicle for materials 55% Liquid component plasma 45% Blood cells Erythrocytes - RBC Leukocytes - WBC Thrombocytes - platelets
41 Connective Tissue Outline Bone Cartilage Hyaline Fibrocartilage Elastic Perichondrium Fibrous Areolar (Loose connective) Adipose Reticular Dense fibrous Regular Irregular Blood Plasma Cells Eryhtrocytes Leukocytes Thrombocytes
42 Muscle Tissue Highly vascular & highly cellular Less matrix = more flexibility More blood flow = more ATP made Actin & myosin contractile myofilaments Function is to produce movement 3 types Skeletal Smooth Cardiac
43 Muscle Tissue Types Skeletal muscle Can be controlled voluntarily Cells attach to connective tissue Cells are striated Cells have more than one nucleus attached to bone Smooth muscle Involuntary muscle Surrounds hollow organs Attached to other smooth muscle cells No visible striations One nucleus per cell Viscera of hollow internal organs
44 Muscle Tissue Types Cardiac muscle Found only in the heart Function is to pump blood (involuntary) Cells attached to other cardiac muscle cells at intercalated disks Cells are striated One nucleus per cell
45 Nervous Tissue Consists of brain, spinal cord, nerves Carry electrical signals Neurons: generate & conduct electricity Usually nonregenerative Neuroglia: support neurons
46 Tissue Repair Determination of type of repair Type of tissue damaged Severity of the injury Regeneration Replacement of destroyed tissue by the same kind of cells Fibrosis Repair by dense fibrous connective tissue (scar tissue)
47 Regeneration of Tissues Regenerate easily Epithelial tissue Bone Regenerate poorly Skeletal muscle replaced with connective tissue, not muscle Cartilage Nervous Replaced largely with scar tissue Cardiac muscle Nervous tissue within the brain and spinal cord Connective - keloids
48 Steps of Tissue Repair 1. capillaries dilate brings blood to supply clotting factors 2. clot forms seal off injury 3. scab forms protect injury 4. debris is cleaned out macrophages eat away damaged tissue to leave room for repair 5. Organization of tissue parts granulation occurs (a type of intermediate tissue) 6. Macrophages digest & remove original clot 7. Surface epithelium regenerates scab usually falls off at this time End result: Healed injury!
49 Tissue Disease
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