HISTO DIGESTIVE Flashcards
its function is to obtain
molecules from the ingested food that are necessary for the
maintenance, growth, and energy needs of the body
gastrointestinal (GI) tract
introduction of food and liquid into the
oral cavity
Ingestion
divides solid food into
digestible pieces
Mastication
muscular movements of materials through the
tract
Motility
local control of motility and secretion
Hormone release
enzymatic degradation of large macromolecules in food to smaller molecules and their subunits
Chemical digestion
4 Main Layers of the Digestive Tract
Mucosa
Submucosa
Muscularis
Serosa
consists of an epithelial lining; an underlying lamina propria of loose connective tissue rich in
blood vessels, lymphatics, lymphocytes, smooth musclecells, and often containing small glands; and a thin layer of smooth muscle
mucous membrane./ mucosa
a thin layer
of smooth muscle separating mucosa from submucosa and allowing local
movements of the mucosa.
muscularis mucosae
contains denser connective tissue with
larger blood and lymph vessels and the Meissner plexus of autonomic nerves
Sub Mucosa
composed of smooth muscle cells organized as two or more sublayers
muscularis
fiber orientation in the internal sublayer
Circular
Fiber orientation in external sublayer
Longitudinal
a thin sheet of loose connective tissue, rich in
blood vessels, lymphatics, and adipose tissue, and covered
with a simple squamous covering epithelium or mesothelium
Serosa
the outermost layer of the digestive tract located
within the abdominal cavity.
Serosa
oral cavity is lined with what cells
Stratified squamous epithelium
a mass of striated muscle covered by mucosa,
which manipulates ingested material during mastication and
swallowing
Tongue
