Tissue: Epithelial
Barriers
Compartments
Covers body surfaces
Lines hollow organs, body cavities and gland ducts
Forms glands
Tissue: Connective
Links tissues and organs
Structural and metabolic support
Stores energy
Forms immune system
Muscle
Contractions
Generates force for motion and substance transport in vessels
Body temp
Nervous
Signals and transmits impulses through ionic conduction
Asymmetrical long cytoplasmic processes
Characteristics of Epthelia
Continuous
Avascular
Anchored by basal lamina (double layer goo with one layer formed from epithelia and one from connective)
Little extracellular matrix
Polarized
Epithelia: Simple Squamous
Single layer flat
Lines body cavities, heart chambers and vessels and alveoli
Reduces friction, controls vessel permeability, absorption and secretion
Epithelia: Simple Cuboidal
Single layer cube
Lined glands and ducts and kidney tubule
Limited protection but does secretion and absorption
Epithelia: Simple Columnar
Single column
Lines digestive tract, fallopian tubes and kidney ducts
Protection absorption and secretion
Epithelia: Stratified Sqaumoud
Stratified with outermost squamous
Locations of mechanical stress ( vagina, mouth, throat, anus)
Has keratin to reduce dehydration
Protects against pathogens and abrasion
Epithelia: Stratified Cuboidal
Outermost cube
Exocrine glands, sweat ducts and mammary glands
Protection secretion and absorption
Epithelia: Pseudostratified columnar
All cells touch basal lamina but not all reach luminal surface
Respiratory and male reproduction
Protection and secretion
Epithelia: Transitional
Multilayer outermost large dome shaped
Only in urinary tract
Permits expansion and recoil acted stretching
Gland formation
Epithelial cells grow into connective tissue
For exo secretory celld remain connected to surface by a duct
Endo lack duct do connecting cells disappear and secretions go into blood vessel
Connective tissue characteristics
Few cells lots of matrix
Connective Tissue Matrix Composition
Ground substance= highly hydrated gel
Collagen- bundles for tensile strength
Reticular- branching network for support
Elastic- thin branching fibers like rubber bands
Mesenchyme
Developing embryo
Stay in adult as stem cells
CT: Loose
Packing material that fills space between organs
Cushioning and support
Lots of ground substance and elastic fibers
Areolar- common least specialized, links organs and tissues
Adipose- fat, deposits, padding and insulation, energy storage
Reticular
CT- Dense Irregular
Little ground substance but lots of fibers
Fibers unaligned
Forms dermis, sheaths around bone, nerve and muscle
Provides strength
Prevents over expansion
CT- Dense Regular
Aligned
Forms tendons (muscle bone) and ligaments (bone bone)
Reduces friction and provides firm attachment
CT- Fluid
Blood
Lymph (dilute solution of proteins and excess interstitial fluid)
CT- Supporting
Cartilage and bone
Incompressible matrix
Muscle tissue characteristics
Elongated specialized to contract and generate force
Muscle: Skeletal
Attached to bone
Steak aged
Voluntary contraction
Multinucleated
Moves and stabilized skel
Generates heat
Muscle: Smooth
Visera
Non striated
Involuntary
Short spindle one nucleus
Walls of vessels and hollow organs
Specialized for slow contraction
Moved food urine and secretions, controls diameter of flow
