review Flashcards
ingestion
introduction of food into stomach
mastication
chewing
Peristalsis
rhythmic, wavelike contractions that move food through GI tract
Segmentation
a secretion or food is introduced, segments of the digestive tract alternate between contraction and relaxation, material is spread out in both directions… essentially mix and break food down into smaller pieces—stationary
Secretion
lubricate, liquefy, digest
mechanical digestion
mastication and mixing of food
chemical digestion
digestive enzymes
absorption
passage of digested end products into blood and lymph
elimination
waste products removed from body in the form of feces
layers of the intestinal tract
mucosa, submucosa, muscularis, serosa
mucosa
inner most
submucosa
thick connective tissue that contains nerves, blood vessels, lymphatic vessels and glands
muscularis
has an inner layer that contains circular smooth muscle and an outer layer that contains longitudinal smooth muscle
serosa
visceral peritoneum, connective tissue layer and is simple squamous epithelium
Muscularis: Usually 2 layers of smooth muscle, what are the two exceptions?
Upper esophagus with skeletal muscle and stomach has 3 layers of smooth muscle
adventita
connective tissue that blends with connective tissue of surrounding structures