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mommy2pj
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Esophagus circular muscle fiber
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esophagus muscular mucosa
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Function of Digestive System
- 1. Protection
- 2. Digestive processes
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What does the digestive system protect from?
- 1. corrosive effect of digest. acid and enzyme
- 2. mechanical stress such as abrasion
- 3. bacteria
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what are the digestive processes?
- 1. ingestion- take food in by mouth
- 2. digestion- chemical breakdown
- 3. secretion- release water, acid, buffer, enzymes into lumen tract
- 4. absorption- passage of end product of digestion from GI tract into blood or lymph
- 5. excretion- removal of waste product
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define defecation?
emptying of rectum
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what is mechanical processing?
mechanical processing- breaks from big peices to small pieces and how we propel the food through digestive system.
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esophagus muscularis mucosa
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esophagus muscularis mucosa
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esophagus stratified squamous epithelium
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What layers form the Mucosa layer of GI tract?
- 1) Epithelium
- 2) Lamina Propria
- 3) Muscularis Mucosa
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What layers form the GI tract from inner to outer?
- 1) lumen
- 2) Mucosa
- 3) Submucosa
- 4) Muscularis
- 5) Serosa
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Describe 3 layers of Mucosa?
1) Epithelium- (stratified squamous) in mouth, pharnyx, esophagus, anus. (simple collumnar) in rest. Goblet cells secrete mucous onto cell surfaces. enteroendocrine cells secrete hormones
- 2) Lamina Propria- thin layer areolar tissue
- 3) muscularis mucosa- thin layer smooth muscle contains circular and longitudinal fibers which cause folds in muscularis layer which increases movement and absorption.
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esophagus epithelium (stratified squamous)
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esophagus epithelium (stratified squamous)
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Histology of submucosa and fxn?
Dense irregular connective tissue containing exocrine glands and lymphatic tissue.
controls vasoconstriction adn local movement by muscularis mucosa smooth muscle.
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what is serosa? adventitia?
serosa- serous membrane covering all organs or walls of cavity not open to outside. secretes slippery fluid that is formed of simple squamous epithelium
adventitia- fibrous connective tissue
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esophagus longitudinal muscle fiber
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Digestion refers to:
chemical breakdown of food
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functions of digestion?
- mechanical processing
- absorption
- compaction
- ingestion
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intestinal hormone that stimulates secretion of duodenal glands?
enterocrinin
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portion of small intestine attaching to large instestine?
ileum
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what triggers gastric secretion of gastric phase?
entry of food into stomach
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what does enteroendocrine cells of stomach secrete?
gastrin
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if a decrease level of bile salt in bile what does it interfere with?
digestion of fat
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which is greater?
pH of blood in gastric veins during digestion of large meal or following a fast?
during digestion of large meal. This is when pH is stimulated
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if duodenal papilla blocked what would happen?
- interfere with neutralization of chyme
- decrease protien digestion
- decrease carb digestion
- impair fat digestion
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what are plicae circulares?
transverse folds in mucosa and submucosa of sm intestine
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what are gastric pits?
pockets in lining of stomach that contain secretory cells
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what is myenteric plexus?
network of neurons
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intestinal hormone stimulates pancreas to release watery secretion high in bicarbonate ion?
secretin
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Intestinal phase of gastric digestion include?
- conrol rate of gastric emptying
- neural and endocrine reflexes involved
- help ensure functions of sm intestine work with effeciency
- begins when chyme enters sm intestine
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when chyme reaches duodenum what happens?
blood levels of secretin increase
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if parotid gland duct is blocked?
interferes with carb digestion in mouth.
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what does pepsin enzyme digests?
protiens
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where are sensory nerve cells, parasympathetic ganglia and sympathetic postganglionic fibers found?
submucosal plexus
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the pancrease secretes what fluid in response to secretin?
rich in bicarbonate
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intestine hormone stimulates gallbladder to release bile?
Cholecystokinin (CCK)
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pancrease secretes fluid in response to cholecystokinin?
rich in enzymes
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which cranial nerves control motor fibers responsible for digestion?
cranial nerve X
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if muscularis mucosa is contracted what happens?
shape of intestinal lumen altered and epithelial pleats adn folds move.
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what does gastroileal reflex do?
make room for more intestinal content by moving chyme to colon
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modifcation of digestive epithelium that allows expansion of organ
presence of folds or pleats
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proteinase produced in stomachs of babies so they can digest milk?
rennin
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intestinal hormone stimulate release of insulin form pancreatic islet ?
gastric inhibitory peptide (GIP)
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why is stomach able to distend as it recieves food?
- 1. loose tissue in form of rugae.
- 2. smooth muscle of stomach is elastic
- 3. increase of sympathetic stimulation druing filling of stomach to decrease tonus of gastric smooth muscle
- 4. mucosa of stomach is elastic
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fxn of large intestine?
reabsorption of water and compaction of feces
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if carbonic anhydrase in parietal cells are blocked?
high pH during gastric digestion
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what do lacteals do?
carry product of digestion that wont pass through walls of blood capillaries
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peristalsis?
waves of muscle contraction tha propel contents of digestive tract from one point to another
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intestine hormone stimulates parietal cells and chief cells in stomach to secrete what fluid?
intestinal gastrin
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if hormone cholecystokinin is blocked ?
composition of pancreatic secretion affected
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where carb digestion begins?
mouth
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disease that causes large portion of gastric mucosa to atrophy, resulting in less secretion by gastric glands.
anemia (intrinsic factor necessary for RBC production)
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what regulates digestive system activities?
- hormones
- parasympathetic/sympathetic neurons
- contents of digestive tract
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plicae and intestinal villi do what?
increase surface area of mucosa of small intestine
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which is false about the secretions from salivary glands?
A) help control bacterial population
B) contain enzymes for digestion of lipid
C) mostly water
D) contain enzymes for digestion of carb
E) help lubricate oral cavity and contents
B) contain enzymes for digestion of lipid (this multiple choice question has been scrambled)
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what does enterokinase do?
activates protien digesting enzymes
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function of oral cavity?
- 1. analyze material before swallow
- 2. lubrication
- 3. mechanical processing of food
- 4. digest carb
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what happens during deglutition?
- soft palate elevates
- upper esophageal sphincter opens
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salivation d/t stimulation of tongue is a result of what ?
parasympathetic innervation
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most products of fat digestion are absorbed by ?
lympghatic vessels
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what enhances absorption effectiveness of small intestine?
- 1. plicae circulares
- 2. microvilli
- 3. intestinal movement
- 4. villi
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what makes up exocrine portion of pancreas?
pancreatidc acini
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when is pharyngeal phase initiated?
bolus comes in contact with pharyngeal arches
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function of toungue?
- 1. mechanical processing food
- 2. manipulation of food
- 3. sensory analysis of food
- 4. aiding in speech
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is pharyngeal phase voluntary or involuntary?
involuntary
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what happens during deglutition?
- breathing stops and airways open
- vocal cords close
- lower esophogeal sphincter contracts
- soft palate lifts
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what is responsible for primary water absorption?
large intestine
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do salavary glands contain enzymes for digestion of simple sugar?
NO
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portion of small intestine attached to pylorus of stomach?
duodenum
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location of digestive organs?
- pancrease extends from duodenum to spleen
- gallbladder is on undersurface of right lobe of liver
- middle part of small intestine is called jejunum
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which teeth are blade shaped for cutting or chopping?
incisors
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function of liver?
- synthesis and secretion of bile
- synthesis of plasma protien
- inactivation of toxin
- storage of glycogen adn lipid reserves
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hormone NOT associated with small intestine?
intrinsic factor
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function of digestive tract lining?
- safeguard nearby tissue
- digest swallowed bacteria
- protect from digestive acid
- protect from abrasion
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which process is ENTIRELY under nervous control?
salivation
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what happens during cephalic phase of gastric digestion?
sight, smell, though,or taste trigger parasympathetic impulses
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function of Kupffer cell of liver
they are phagocytic
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which teeth are pointed and adapted for tearing and shreddding?
cuspid
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what stimulates gastric emptying?
- distention of stomach
- gastrin
- partially digested protien
- vagus nerve
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organ responsible for dehydration and compaction of indigestible material?
large intestine
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function of salivary secretion?
- aid in chewing and swallow
- initiate digestion of starch
- needed for taste
- moisten and lubricate food
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example of mastication?
mechanical digestion
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what does pancreas produce?
- lipases and amylase
- nucleases
- peptidases and protienases
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structures containing goblet cells?
- stomach
- transverse colon
- small and large intestine
- (NOT) ESOPHAGUS
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which teeth are with flattened crowns and prominent ridges for grinding?
molars
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where absorption of nutrients happens?
small intestine
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teeth also known as canines?
cuspids
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primary chemical digestion in large intestine will happen because of what enzyme
bacterial enzyme
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pancreas produces why type of enzyme in form of proenzyme?
protien
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what is segmentation?
chyme and digestive juices mixing by localized contractions of muscularis of sm intestine
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function of canine or cuspid ?
tearing and ripping
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function of stomach?
- store ingested food
- denaturation of protien
- initiation of protien digestion
- mechanical breakdown of food
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middle portion of small intestine?
jejunum
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where is bile stored?
gallbladder
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muscularis layer contains what muscles?
- skeletal muscle
- smooth muscle
- (so has both parasympathetic and sympathetic innervation)
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plica cirularis?
folds that can NOT stretch, and only for increasing surface area for absorption.
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which teeth will crush, mash and grind food when it enters mouth?
bicuspid
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what is secreted by parietal cells?
hydrochloric acid
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which organ is in charge of digestion and absorption of nutrients?
small intestine
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where are brush border enzymes found?
small intestine
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does mucosa of large intestine have villa and plica?
no it is smooth with no villa or plica
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what fluid do goblet cells secrete?
mucus
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what hormone stimulates the secretion of the stomach and contraction of stomach wall?
gastrin
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when does peristalsis occur?
during esophageal phase of deglutition
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what fluid do cheif cells secrete?
pepsinogen
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what hormone is required for absorption of vitamin b12?
intrinsic factor
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what hormone controls emptying bile from gallbladder?
cholecystokinin
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what happens when hydrolytic reactions catalyze trypsin?
peptides are produced
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retroperitoneal organs (list)?
- Duodenum
- Pancreas
- Kidneys
- Adrenal glands
- Bladder
- Ascending colon
- Descending colon
- Rectum
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permanent teeth are called ?
secondary dentition
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branch of hepatic portal vein
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branch of hepatic portal vein
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