Alimentary Canal Flashcards
It is the breakdown id ingested food and the absorption of nutrients into the blood
Digestion
• production of cellular energy (ATP)
• constructive and drgradative cellular activities
Metabolism
ATP stands for?
Adenosine Triphosphate
2 main groups of the Digestive system
• alimentary canal
• accessory digestive organ
Organs of the alimentary canal
• mouth
•pharynx
• esophagus
•stomach
•small intestine
•large intestine
• anus
Protect the anterior opening
Lips( Labia)
Form the lateral walls
Cheeks
Forms the anterior roof
Hard palate
Forms the posterior roof
Soft palate
Fleshy projection of the roof soft palate
Uvula
Spaces between lips externally and teeth and guns internally
Vestibule
Area contained by the teeth
Oral cavity
Attached at hyoid and styloid processes of the skill and by the lingual frenulum
Tongue
2 type of tonsils
• palatine tonsils
• lingual tonsil
Processes of the mouth
•mastication(chewing) of food
•mixing masticated food with saliva
•initiation of swallowing by the tongue •allowing for the sense of taste
3 types of pharynx
• nasopharynx
•oropharynx
•laryngopharynx
It is not part of the digestive system
Nasopharynx
Posterior to oral cavity
Oropharynx
Below the oropharynx and connected to the esophagus
Laryngopharynx
Serves as the passageway for air and food
Pharynx
2 muscle layers of the esophagus
•Longitudinal inner layer
• circular outer layer
Food movement by contractions of the muscle layers
Peristalsis
•runs from the pharynx to stomach through the diaphragm
• conducts food by peristalsis
• passageway dor food only
Esophagus
Layers of alimentary Canal organs
• mucosa
•submucosa
• muscularis externa
•serosa
•innermost layer
• moist membrane
•surface epithelium
• small amount if connective tissue(lamina propria)
•small smooth muscle layer
Mucosa
•jsut beneath the mucosa
•Soft conenctive tissue with blood vessels, nerve endings, and lymphatics
Submucosa
•just beneath the mucosa
•Soft conenctive tissue with blood vessels, nerve endings, and lymphatics
Submucosa
•smooth muscle
• inner circular layer
• outer longitudinal layer
Muscularis externa
•The outer most layer - visceral peritoneum
• layer of serous fulid- producing cells
Serosa
•located on the left side of the abdominal cavity
• food enters at the cardioesophageal sphincter
Stomach
Regions of the stomach
•cardiac region
• fundus
• body
• pylorus
Funnel-shaped terminal end
Pylorus
Food empties jnto the small instestine at the _______________
Pyloric sphincter
Internal folds of the mucosa
Rugae
External regions of the stomach
•Lesser curvature
• greater curvature
Layers of peritoneum attached to the stomach
•lesser omentum
•greater omentum
Attaches the liver to the lesser curvature
Lesser omentum
Attaches the greater curvature to the posterior body wall
Greater omentum
•acts as the storage tank for food
• site of food breakdown
• chemical breakdown of protein begins
• delivers chyme (processed food) to the small intestine
Stomach
Specialized mucosa of the stomach
• simple columnar epithelium
• mucous neck cells
• gastric glands
• chief cells
• parietal cells
• endocrine cells
Produce a stick alkaline mucus
Mucous neck cells
Secretes gastric juice
Gastic glands
Produce protein-digesting enzymes (pepsinogens)
Chief cells
Produce hydrochloric acid
Parietal cells
Produce gastrin
Endocrine cells
It is formed by folded mucosa
Gastric pits
• the body’s major digestive organ
• site of nutrient absorption into the blood
• muscular tube extending form the pyloric sphicter to the ileocecal valve
• suspended from the posterior abdominal wall by the mesentery
Small intestine
Subdivisions of the small intestine
• duodenum
• jejunum
• ileum
• attached to the stomach
• curves around the head of the pancreas
Duodenum
Attaches anteriorly to the duodenum
Jejunum
Extends from jejunum to the large intestine
Ileum
Digested food in the stomach with gastric juices
Chyme
It is a masticated food mixed with saliva
Bolus
Bile enters from the _____
Gallbladder
• finger-like structure formed by the mucosa
• give the small intestine more surface area
Villi
•small projecttions of the plasma membrane
• found on absorptive cells
Microvilli
Structures involving in absorption of nutrients
• absorptive cells
• blood capillaries
• lacteals
Folds of the small intestine is called
Circular folds or plicae circulares
Larger in diameter, but shorter than the small intestine and it frams the internal abdomen
Large intestine
Produce mucus to act as a lubricant
Goblet cells
Saclike first part of the large intestine
Cecum
• accumulation of lymphatic tissue tagt sometimes becomes inflamed
•hangs from the cecum
Appendix
Walls are formed into pocketlike sacs in the large intestine is called____
Haustra
What do you call the crossing of the large intestine? Each side roght and left
• right colic (hepatic) flexure
• left colic ( splenic) flexure