Bio 50A- Tissues

What are the 4 types of tissue?

Epithelial, Connective, Muscle, and Nervous Tissue

What are the 5 Epithelial Tissue Characteristics?

• Polarity

• Closely packed cells

• Avascular but innervated

• Support from reticular lamina

• High Rate of Regeneration

Simple Squamous Epithelium

• one layer 

• flat cells 

• function: allow materials to diffuse; lubricate serosa 

• Location: serous membranes, blood and lymphatic system, alveoli, lining of heart 

Simple Cuboidal Epithelium 

• one layer 

• cube like cells 

• Function: to secrete and absorb

• Location: kidney tubules, walls of smallest ducts of glands

Simple Columnar Epithelium 

• one layer 

• tall/ column like cells 

• can have cillia 

• Function: absorb and secrete mucus, propel mucus

• Location: digestive tract, gallbladder; cilliated- fallopian tubes, respiratory system 

Pseudostratified Columnar

• 1 layer of cells at different heights 

• looks like multiple layers 

• can have goblet cells and cillia

• Function: secrete and move mucus

• Location: trachea, upper respiratory tract, ducts of large glands, tubules in testes

Stratified Squamous Epithelium

• multilayered

• flat/ scale like cells at apical surface

• can have keratin

• Function: protect high wear and tear areas

• Location: Keratinized: skin/ high wear and tear areas; Nonkeratinized: mouth, esophagus, vagina ( moist linings)

Transitional

• multilayered

• has columnar and cuboidal at base

• Function: Stretch organ to release urine; cell change shape when stretched

• Location: Urogenital areas ( bladder, ureters, urethra)

What are the functions of connective tissue?

• binding and support

• protection

• insulation

• storing reserve fuel

• transportation ( blood only)

What are the 4 classes of connective tissue?

• Connective Tissue Proper

• Cartilage

• Bone

• Blood

What types of fibers are in connective tissue?

• collagen (white)

• elastic ( usually black)

• reticular ( short and branched)

What is the difference between “blast” and “ cyte” cells?

Blast - immature cell

Cyte- mature cell that maintain health

What are the loose connective tissue types?

• Arreolar

• Reticular

• Adipose

What are the dense connective tissue types?

• Regular

• Irregular

• Elastic

What are the cartilage tissues?

• Hyaline

• Elastic

• Fibrocartilage