Unit 2 Flashcards
Stem cells
Reproduce- split
Differentiate-change to different cell
Totipotent
Fertilized egg cells
Become any cells type
Pluripotent
Embryonic cell
One lineage, numerous cells types
Ectoderm, mesoderm, endoderm
Multipotent
Makes a few types
Ectoderm
Forms numerous epithelial tissue/nervous tissue
Mesoderm
Muscle, CT
Endoderm
Lines respiratory + digestive systems
Epithelial tissue
Glandular
Covers/lines
Protects from microbes
Controls permeability
Secretes
Senses
Cellularity (epithelia)
Fit closely together to form sheeg
Polarity (epithelial)
Free surface, base surface
Apical and basal side
Apical surface
Free or exposed surface
Basolateral surface
Attached surface
Basement membrane
Reinforces epithelium
Formed by basal lamina and reticular lamina
Basal lamina
Formed by glycoprotein
Compartmentalizes
Scaffold tissues
Reticular Lamina
Contains collagen fibers
Anchors epithelium to CT
Tight junctions
Encircle cell
Between adjacent cell
Adhering junction
Completely encircled cell
Inferior to tight junctions
Desmosomes
Sometimes located on basal surface (hemidesmosomes)
Simple epithelia
Absorption, secretion, filtration
Simple squamous
Rapid diffusion, body parts with little wear and tear
(Kidney, alveoli, vascular system)
Simple cuboidal
Secretion absorption
Kidney, salivary glands, pancreas, liver
Simple columnar
Absorption secretion
Ducts, gall bladder, fallopian tube, GI
Psuedostratified columnar
Secretion absorption
Anchored in basement membrane
Ducts of large glands, trachea, bronchi
Stratified squamous
Keratinized
Non keratinized- lines moist cavities
