Tissues Flashcards
Four major families of tissues
- epithelial tissues
- Connective tissues
- Muscular tissue
- Nervous tissue
________ = Groups of _____ that have a common origin and function
_________ = layers of tissues
Epithelial tissue lines or covers _______ or forms secretion portion of gland
body cavities
Epithelial tissue functions
-Protects
-Secrete
-Absorb
-Excrete
Epithelial cells general features
- Tightly packed cells, many cell junctions
- Variable shapes
- Sheets and layers
- Very little ECM
- Avascular
- High capacity for cell division
Epithelial cell specific features
- Apical surface
- Lateral surface
- Basal surface
- Basement membrane
Types of layers of surface epithelium
- Simple (unilaminar) epithelium
- Psuedostratified
- Stratified (multilaminar) epithelium
Function of simple epithelium
- Filter / absorb
- Secrete
Function of psuedostratified
- Movement
- Secrete
Function of stratified (multilaminar) epithelium
- Protect
Surface epithelium cell shapes
- Squamous
- Cuboidal
- Columnar
- Transitional
Surface epithelium: squamous cells
- Thin, flat
- Allow passage of materials
- Membranes
Surface epithelium: Cuboidal cells
- Secretion and absorption
Surface epithelium: Columnar
- Secretion
- Absorption
- Protection
Surface epithelium: Transitional
- Change shape
- Eg. wall of bladder
2 major types of epithelial tissues
- Surface epithelial tissue
- Glandular epithelial tissue
Surface epithelial tissue types
- Simple
- Pseudostratified columnar
- Stratified
Simple surface epithelial tissue
- Simple squamous
- Simple cuboidal
- Simple columnar
Stratified surface epithelial tissue
- Stratified squamous
- Stratified cuboidal
- Stratified columnar
- Transitional
2 types of simple squamous cells
- Mesothelium
- Endothelium
Mesothelium
lines serous membranes
Endothelium
Lines inner wall of arteries, capillaries, and veins
2 types of simple columnar epithelium
- Non ciliated
- Ciliated
Non ciliated
- lines much of the GI tract
- Contains microvilli and goblet cells
Ciliated
- Lines most of the respiratory tract and fallopian tubes
- contains cilia and goblet cells
- Used for absorption and secretion
Stratified epithelial tissues: structure
- Multiple layers; Deepest layer and apical (surface) layer
- Some have keratin
Types of Stratified Epithelial Tissues
- Stratified squamous
- Stratified cuboidal
- Stratified columnar
- Transitional
Stratified squamous cells are in
- SKIN
- Lining of vagina
Stratified cuboidal cells (limited) are in
- Adult sweat glands, etc.
Stratified columnar cells (limited) are in
- Urethra
- Esophageal glands, etc.
Transitional stratified epithelial tissues
- Variable appearance
- Elasticity
2 types of Glandular epithelial tissue
- Endocrine glands
- Exocrine glands
2 types of exocrine glands
- Simple
- Compound
Glandular epithelium
- Specialized epithelial cells organized to form glands that secrete substances into ducts, onto a surface, or within interstitial fluid (diffuse into bloodstream)
Connective tissue
- Very abundant in body
- Variety of examples
Connective tissue functions
- Bind
- Protect
- Separate structures
- Transport (blood)
- Store energy (adipose)
- Immune response
2 types of connective tissues
- Embryonic connective tissues
- Mature connective tissues
2 types of Embryonic connective tissues
- Mesenchyme
- Mucous
3 types of Mature connective tissues
- Connective tissue proper
- Supporting connective tissue
- Liquid connective tissue
2 types of connective tissue proper
- Loose
- Dense
2 types of supporting connective tissue
- Cartilage
- Bone
2 types of liquid connective tissue
- Blood
- Lymph
Connective tissue features
- Rich blood supply (except cartilage, tendons)
- Nerve supply (except cartilage)
- Various cells within the tissue
- Extensive Extracellular Matrix (ECM)
Various cells in connective tissue
- Immune related
- Fibroblast
- Adipocytes, Plasmocytes
Immune related cells in connective tissue
- Macrophages
- Mast cells
Fibroblast cells in connective tissue
- Blast cells
Adipocytes and Plasmocytes in connective tissue
- Cyte cells
2 components of the extensive extracellular matrix
- Ground substance
- Fibers
Extracellular Matrix
- Main component is Ground Substance
Ground Substance
- Secreted by:
- Fluid, semifluid, gelatinous, calcified
- Supports, binds, and maintains health of connective tissues
- Water in ground substance “trapped” by GAGs
Glycosaminoglycans (GAGs)
- Polysaccharides and proteins
- Hyaluronic acid
- Chondroitin sulfate, etc.
- Fibronectin
GAGs: hyaluronic acid functions
- Lubrification
- Liquification
GAGs: Chondroitin sulfate functions
- Support
- Adhesions
GAGs: Fibronectin function
- Adhesion
Fibers within extracellular matrix
- Collagen
- Reticular
- Elastic
Fibers within ECM: collagen
- Strong parallel bundles
- Resists tension, provides strength
Fibers within ECM: Reticular
- Thin bundles of collagen with glycoprotein coat
- Branching networks that provide support
Fibers within ECM: Elastic
- Network of single fibers
- Elasticity
3 types of Loose connective tissue
- Aerolar
- Adipose
- Reticular
Areolar tissues
- Abundant in body
- Subcutaneous skin, surrounding blood vessels, nerves, and organs
Adipose tissues
- Found everywhere areolar tissue is located
- White adipose and Brown adipose
White adipose
increased blood vessels
Brown adipose ( in infants)
GOOD
Reticular tissues
- Forms stroma of organs
- Support, binds, filters
3 types of Dense Connective tissue
- Regular
- Irregular
- Elastic
Regular dense connective tissue
- Forms tendons, ligaments, and aponeuroses
- Strong attachments and pulling strength
Irregular dense connective tissue
- Forms sheets of fascia, fibrous portions of membranes, joint capsules, periosteum of bone, etc.
- Super tensile strength
Elastic dense connective tissues
- Found in lungs, tubes, etc.
- Elasticity
Blood: Liquid connective tissue
- Plasma = Liquid ECM
- Formed elements = Cells
- Location - in vessels and arteries
- Function - Carry oxygen to heart and carbon dioxide out; transports nutrients
Blood composition
- 55% blood plasma
- Buffy coat composed of white blood cells and platelets
- 45% red blood cells
Bone: calcified connective tissue function
- Support
- Protection
- Storage (minerals, houses marrow)
- Levers for human movement
- Contains bone cells and calcified extracellular matrix
Bone cells
- Osteoblasts
- Osteocytes
- Osteoclasts
Calcified Extracellular matrix
- 15% water
- 30% collagen fibers
- 55% mineral salts (hydroxyapatite)
Bone formation from bone cell lineage steps
- Osteoprogenitor cells
- Osteoblast
- Osteocyte
Bone formation from white blood cell lineage
- Osteoclast
1st step of bone tissue formation: Osteoprogenitor cell
- develops into an osteoblast
2nd step of bone tissue formation: Osteoblast
- Forms bone extracellular matrix
3rd step of bone tissue formation: Osteocyte
- Maintains bone tissue
4th step of bone tissue formation: Osteoclast
- Functions in resorption, the breakdown of bone extracellular matrix
Cartilage: supportive connective tissue
- Hyaline/Articular
- Fibrocartilage
- Elastic
Hyaline/Articular cartilage components
- Most abundant cartilage in the body, at the ends of long bones, ribs, nose, parts of respiratory tract, and embryonic and fetal skeleton
Hyaline/Articular cartilage functions
- Allows joint movements (reduced friction)
- Flexibility
- Support
Fibrocartilage: froms discs -
- Punic symphysis
- intervertebral discs
- menisci of the knee
Fibrocartilage functions
- Support
- Strength
- Rigidity
Elastic cartilage components
- Epiglottis
- Part of external ear (auricle)
- Auditory (eustachian) tubes
Elastic cartilage functions
- Elasticity
- Shape and strength
Membranes - Tissue layers
- Covers surfaces, cavities, organs
2 types of tissues in membranes
- Epithelial membranes
- Synovial membranes
tissues in Epithelial membranes
- Connective tissue
- Epithelial tissue
Tissue in synovial membranes
- Dense connective tissue
- Serous connective tissue
3 types of epithelial membranes
- Mucous
- Cutaneous
- Serous
Mucous membrane
- Lining of small intestine; epithelial layer and connective tissue layer
Cutaneous membrane
Skin
- Epithelial layer
- Connective tissue layer
Serous membrane
Pleura, Pericardium, Peritoneum
- Double membrane with serous fluid between
- Parietal
- Visceral
Serous membrane examples
- Membranes of thoracic cavity; pleura and Pericardium
- Membranes of the abdominopelvic cavity; Peritoneum
What are the 4 tissue types in the human body?
How does structure influence function?
Identify the tissue types and layers in heart wall