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EPITHELIAL TISSUESquamousCuboidalColumnar
SimpleStratified
Simple squamous: air sacs of lungs, diffusion
Simple cuboidal: kidney tubules, filtration
Simple columnar: lining of intestines, secretion and absorption
Stratified Squamous: skin, lining of mouth, esophagus and rectum, protection
Pseudostratified ciliated columnar, lines respiratory tract, secretion
Epithelial Quiz Simple squamous tissue
Exocrine Glands: secrete to ducts that lead into or out of the body
Merocrine: exocytosis, eccrine sweat glands, salivary, pancreas, etc
Apocrine: tip pinches off, axillary and groin sweat glands
Holocrine: cells rupture when secrete, oil glands
Endocrine: secrete to blood
Apocrine: apex pinches off like a Hershey kiss
Classification of Body MembranesClassification of Body Membranes
Slide 4.2Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Epithelial membranes
Cutaneous membrane
Mucous membrane
Serous membrane
Connective tissue membranes
Cutaneous MembraneCutaneous Membrane
Slide 4.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Cutaneous membrane = skin A dry membrane
Outermost protective boundary
Superficial epidermis Keratinized stratified
squamous epithelium
Underlying dermis Mostly dense
connective tissue Figure 4.1a
Mucous MembranesMucous Membranes
Slide 4.4Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Surface epithelium
Type depends on site
Underlying loose connective tissue (lamina propria)
Lines all body cavities that open to the exterior body surface
Often adapted for absorption/secretion
Figure 4.1b
Serous MembranesSerous Membranes
Slide 4.5Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Surface simple squamous epithelium
Underlying areolar connective tissue
Lines open body cavities that are closed to the exterior of the body
Serous layers separated by serous fluid
Figure 4.1c
Serous Membranes Parietal: against
the body wall (side)
Visceral: on the organs (guts)
Serous Membranes
Heart: visceral and parietal pericardium
Lungs: visceral and parietal pleura
Intestines: visceral and parietal peritoneum
Functions of skin Protects deeper tissues from:
Mechanical damage Chemical damage Bacterial damage Thermal damage Ultraviolet radiation Desiccation
Skin functions continued Aids in heat regulation Aids in excretion of urea and uric acid Synthesizes vitamin D
Skin coloring Melanin
Yellow, brown or black pigments Carotene
Orange-yellow pigment from some vegetables Hemoglobin
Red coloring from blood cells in dermis capillaries
Oxygen content determines the extent of red coloring
Review of Skin Layers Epidermis: epithelial tissue
Stratum Corneum (cells full of keratin, dead) Stratum Lucidum (only in palms and soles) Stratum Granulosum Stratum Spinosus Stratum Basale (only mitotic layer, contains
melanocytes
Dermis: Connective Tissue Papillary layer: vascular, fingerprints Reticular layer: Contains structures
(sweat and oil glands, hair follicles, etc)
Hypodermis: Adipose tissue for insulation and cushioning
Skeletal Muscle CharacteristicsSkeletal Muscle Characteristics
Slide 6.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Most are attached by tendons to bones
Cells are multinucleate
Striated – have visible banding
Voluntary – subject to conscious control
Cells are surrounded and bundled by connective tissue
Cardiac Muscle CharacteristicsCardiac Muscle Characteristics
Slide 6.7Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Has striations
Usually has a single nucleus
Joined to another muscle cell at an intercalated disc
Involuntary
Found only in the heart Figure 6.2b
Smooth Muscle CharacteristicsSmooth Muscle Characteristics
Slide 6.6Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Has no striations
Spindle-shaped cells
Single nucleus
Involuntary – no conscious control
Found mainly in the walls of hollow organs
Figure 6.2a
Connective Tissue Characteristics
Variations in blood supply Some tissue types are well vascularized Some have poor blood supply or are avascular
Extracellular matrix Non-living material that surrounds living cells
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