Anatomy (epithelium) Flashcards
28/09/20 epithelium
Body Cavities (4)
Thoracic
Abdominal
Pelvic
Cranial
Membranes of cavities
Pericardium (heart <3 )
Peritoneum (abdomen/ pelvic)
Pleura (lungs)
Organ Systems
Endocrine Respiratory Cardiovascular Reproductive Integumentary Lymphatic Gastrointestinal Renal Nervous Locomoter
Primary Tissues (4)
Connective
Epithelial
Muscle
Nervous
Functions of epithelium
- transport material
- protects underlying tissue
- absorption of water/ nutrients, secretions
Surface epithelium
continuous sheets of cells that cover surfaces
Glandular epithelium
- down growth of epithelium into underlying deeper tissue to form a gland
- exocrine and endocrine
Exocrine duct
maintains a link with the surface, usually by a duct through which secretion is released
Endocrine duct
connection with surface is lost during development, secretions released to surrounding tissue and to local capillaries
Exocrine mechanism of secretion (3)
Merocrine- secretion from apical cell surface (exocytosis)
Apocrine- partial loss of apical parts of cell
Holocrine- entire cell and its products
Endocrine mechanism of secretion
secretes from base of cell
Surface epithelium characteristics
- basement membrane
- polarity- have apical, lateral and basal surfaces
- contiguous adhesive cells bound by intercellular junctions
- no direct blood supply (depends on diffusion from underlying tissues)
- high mitotic activity
Basement membrane definition and 3 parts
- thin protective layer
1- support and anchor epithelium adjacent to tissue
2- physical and selective diffusion barrier between epithelium and adjacent tissue
3- essential for epithelial cell proliferation and polarisation