Ch 24 test Flashcards
an active process involving conscious choice and decision making
ingestion
digestion
chemical processing of food into small parts for utilization
movement of nutrients from lumen of system into bloodstream
absorption
excretion
removal of wastes
defecation
ejection of waste materials
peritoneum
serous membrane that covers the organs of the abdominal pelvic cavity
ventral mesenteries-2
- lesser omentum
2. falciform ligament
lesser omentum
connects the stomach to the liver
falciform ligament
connects the liver to the diaphragm, seperates the lobes
dorsal mesenteries-3
- greater omentum
- mesentery proper
- mesocolon
greater omentum
hangs as an apron over the anterior of the small intestine
mesentery proper
holds the small intestine
mesocolon
transverse and sigmoid colons
histology digestion- stratefied squamous
mouth, pharynx, larynx, esophagus, anus
histology digestion- simple columnar w goblet cells
secretion and absorption
stomach, small intestine, large intestine
enteroendocrine cells
scattered cells in the tract that secrete hormones
longitudinal folds
folds in mucosa that disappear as the tract fills and expands
plicae
permanent transverse (circular) folds that aid in surface area and churning food
peristalsis
movement of bolus through intestines
short reflexes
receptors stimulate myenteric-> stimulates secretory cells and peristalsis
long reflexes
stimulate CNS-> sympathetic and parasympathetic responses triggered
salivary amylase
breaks down starches (carbs) in mouth
lingual lipase
breaks down lipids in mouth
uvula
extension off soft palate to ensure food does not get swallowed until properly chewed
salivary glands-3
- parotid gland-25%
- sublingual gland- 5%
- submandibular glands-70%
parotid glands
largest glands in cheek, produce amylase
sublingual glands
floor of mouth, produces buffers and lubricants
submandibular glands
secretes buffers, glycoproteins, mucins, and amylase
types of teeth-4
- incisors-blade
- cuspids (canines)- tearing
- bicuspids (premolars)-course grinding
- molars- fine grinding
does not have a serosa layer but an adventitia layer of connective tissue
esophagus
swallowing
deglution
swallowing 3 phases
- buccal
- pharyngeal
- esophageal
intrinsic factor
produced in the stomach, glycoprotein needed for B12
cardia
stomach region, entrance for the esophagus
fundus
stomach region, superior to the esophageal entrance
body of stomach
largest portion for mixing chyme
pylorus
distal end of stomach
antrum of stomach
cavity portion
canal of stomach
empties into duodenum
sphincter of stomach
regulates release of chyme
rugae
longitudinal folds on empty stomach for expansion
3 layers of muscularis externa
- oblique-inner
- circular
- longitudinal-outer
gastric pits
functional portion of mucosa
gastric glands
connect to the gastric pits
parietal cells
intrinsic factor for B12 absorption
chief cells-2
- pepsinogen
2. gastric lipase
pepsinogin
converts to pepsin in presence of HCl, breaks down proteins
pyloric glands-2
- gastrin- stim the secretion of parietal and chief cells
2. somatostatin- D cell production to inhibit gastrin
Cephalic phase
CNS controlled
prepares stomach for food
starts by sight, smell, thought
gastric phase
arrival of food in stomach
intestinal phase
chyme enters small intestine
intestinal juice-3
- secretin
- CCK
- gastrin
gastroenteric reflex
stimulates motility and secretion as stomach fills
gastroileal reflex
relaxes the illeocecal valve to create space for new food
small intestine segments-3
- duodenum
- jejunum
- ileum
large intestine segments-3
- cecum
- colon
- rectum
cecum
first part of large intestine, appendix
haustra
pouches or folds for expansion and elongation of colon
teaniae coli
longitudinal bands of smooth muscle that create the haustra
epiploic appendages
fatty sacs in the colon
colon regions-4
- ascending
- transverse
- descending
- sigmoid
colon flexures-3
- hepatic flexure
- spleenic flexure
- sigmoid flexure
internal sphincter
autonomic, inner sphincter
external sphincter
voluntary control
vitamins absorbed in colon-3
- vit K
- biotin
- B5 pantothenic acid
organic wastes-4
- ammonia
- indole and skatole
3 hydrogen sulfide - indigestible carbs
pancreatic acini
cuboidal epi that secreates panc juice
panc juice-4
- pancreatic alpha amylase-carbs
- pancreatic lipase- lipids
- nucleases- nucleic acids
- proteolytic enzymes
proteases
break large proteins- trypsinogen
peptidases
break small peptide chains
liver lobes-4
- right
- left
- caudate
- quadrate (seperated from left by round ligament)
Kupffer cells
macrophages found in liver
cystic duct
fills gall bladder by backflow from common bile duct