Digestive system Flashcards
When it comes to binding of Immunglobin A to non cell mediated it is called
oppsinization
How many tastes of the tongue and what are they
5 Tastes Sour Bitter Salty Unami Sweet
What are the cells in the Stomach and there functions
Chief Cells: and Pepsin
PARIETAL CELLS: Secrete gastric Acid
Neck Cells: Mucous epithelial cells function unkown
G Cells: Cells in stomach and duodenum that releases Gastrin
STEM Cells:
Name all the sphincters in the Digestive System and function
Lower esophageal or cardiac: sphincter between esophagus and stomach.
Pyloric Sphincter: between stomach and duodenum.
Ileocecal Sphincter between small intestine and caecum
Anal Sphincter at end of rectum.
Upper esophageal. Sphincter between mouth and esophagus.
How many IG What are all the Immunoglobins function?
Ig A: mucous glands like salivary tears sweat glands etc
Ig E: In Milk
Ig D: On red Blood cells Rhesus
Ig M: Pentomer on MHC on Lmphyocytes
Ig G: Free floating antibodies made by B Cells
How many layers and function of the layers of The gastrointestinal walls
Mucosa: Epithelia cells
Submucosa:
Muscularis: Shortening and or Walls
Serosa/ Advantitia
What is the criteria to being an epithelia Cell
Free surface Cell
Densely Packed
Avascular
Polarized/Nonsemetical aka has an apical and basal side
3 Things needed to be classified as a mucosa are
Must have
Epithelial cells
Basement Membrane
Mucosa Muscularis
The smooth muscle cells that form the foldings and contraction of the small intestine called
Mucosa Muscularis
The inner lining of the digestive tract, called the
mucosa or mucousmembrane
The epithelium of the digestive system is majority ___ except for where?
simple columnar in everywhere but esophagus and anal cavity where it is stratified squamous to protect against abrasion
The digestive tract as a whole is made up of
mucosa/ columnar epithelium
loose connective tissue called lamina propria
and smooth muscle tissue called muscularis
what does the submucosa consist of
aerolar tissue
nerves and vasularities
fiber created by fibroblasts
What is the Enteric Nervous System and what is it a subdivision for
the submucosal plexus in the submucosa and
the myenteric plexus
True /False Salivary glands is controlled by the parasympathetic nervous system?
false its controlled by the sympathetic NS
What are the two network of neurons in the enteric system and what are there functions
Submucosal plexus: plexus controls movements of the muscularis mucosa and glandular secretion
Myenteric plexus: controls peristalsis and other contractions of the muscularis externa,
The foldings in the stomach are know as..
Ruge
what is the Largest fold in the small intestine know as?
What are the characteristics?
Semicircular Pilae
Glands involved in Digestion
Sublingual Submadibular
5 stages of Digestion and function
Ingestion Digestion Absorption Compaction Excretion
what is syncytium and what cells are examples of this
Are multinucleated structures such as skeletal muscles and osteoclasts
define the 2 types of syncytium
True actually have multiple nucleated cells
Functional only act example
myocardiocytes couple with gap junctions act as a multinucleate group
segmental contraction is
where does it occur
contraction that mixes up chyme
occurs in the small intestine
the three parts of the small intestine in order are
the Duodenum
the Jejunum
the Ileum
In simple terms define Peristalsis
Wave like contractions
what are the two types of contractions
Peristalsis and Segmental Contractions
How many glands and functions are in the digestive system
sublingual
submandibular
Parotid
What is transducin
G couple protein receptor that reponses to sweet chemicals
T or F Gaba is release with to stop cl inflow in b cells
false GABA allows cl flow into alpha cells to hyperpolarize alpha cells preventing calcium for entering and releasing glucagon
T or F Glucagon and Insulin can both be released at the same time
False GABA Prevents that
What happens when Transducin is excited or binded to
G coupled protein receptor
alpha protein activates
what are the two most important ions
Hydrogen and potassium
what is the role of potassium in the body
Potassium regulates the resting membrane potential
what are the three large main layers of the digestive system
mucosa
submucosa
muscularis externa
serosa/adventia
what layers create the mucosa
Epithelium
lamina propria
muscularis mucosae
Which epithelium are in which cavities of the digestive system
stratified squamous are in the mouth and esophagus and lower anal canal for help against abrasion
Ciliated Columnar for the small and large intestine
where is the lamina propria and whats its role and the cells involved
its between the epithelium and muscularis mucosae and its a connective tissue with fibroblasts
Role of the muscularis mucosae
The muscularis mucosae tenses the mucosa, creating grooves and ridges that enhance its surface area and contact with food
Main role of the submucosa
The submucosa is a thicker layer of loose connective tissue containing blood vessels and lymphatics, a nerve plexus, and in some places, glands that secrete lubricating mucus into the lumen. The MALT extends into the submucosa in some parts of the GI tract.
Define the muscularis externa
The muscularis externa consists of usually two layers of muscle near the outer surface. Cells of the inner layer encircle the tract while those of the outer layer run longitudinally.
The enteric Nervous system controls which organs
he esophagus, stomach, and intestines
which nerve controls peristalsis and muscularis exeterna
myenteric NS
WHat does the submucosal plexus innervate?
glandular and muscularis mucosae
hey are not tightly bound to the abdominal wall,
but over most of their length, they are loosely suspended from it by connective tissue sheets called
mesenteries
what is a mesenteries and what is it made up of
Mesenteries is connective tissue that hold the abdominal viscera in their proper relationship to each other, provide passage for the blood vessels and nerves that supply the digestive tract, and contain many lymph nodes and lymphatic ves- sels.
which organs lie on the retroperitoneal side ?
The duodenum
most of the pancreas
parts of the large intestine are retroperitoneal.
which organs lie on the intraperitoneal side ?
Stomach,
liver,
parts of the small and large intestines are intraperitoneal
What is the parietal peritoneum
parietal peritoneum is a serous membrane that lines the wall of the abdominal cavity.
what is a serous membrane? where are the serous membranes in the body?
mesothelial tissue that lines certain internal cavities of the body, forming a smooth, transparent, two-layered membrane lubricated by a fluid derived from serum. The peritoneum, pericardium, and pleura are serous membranes.
wiki definition of mesentary
mesentery: The membrane that attaches the intestines to the wall of the abdomen and maintains their position in the abdominal cavity to supply them with blood vessels, nerves, and lymphatics.
T/F Omentum comes from peritoneum
true it does come from peritoneum
whats the difference between Omentum and messentary
Omentum peritoneum with fat covers both sides of stomach with peritoneum. acts as insulation.
T/F: the liver is on the left side of the body and is above the stomach
False Liver is on the right side and sits slightly above the stomach
what organs are right below the stomach?
Large Intestine
The 3 mechanisms that control the motility and secretion of the digestive system are
Hormonal
Paracrine
Nervous systems
Roles of Saliva are
Saliva moistens and cleanses the mouth, inhibits bacterial growth, dissolves molecules so they can stimulate the taste buds, digests a little starch and fat, and makes swallowing easier by binding the food particles into a soft mass (bolus) and lubricating it with mucus.
the compounds in saliva are
∙ mucus, which binds and lubricates the food bolus;
∙ electrolytes, salts of Na+, K+, Cl–, phosphate, and bicarbonate;
∙ lysozyme, an enzyme that kills bacteria;
∙ immunoglobulin A (IgA), an antibacterial antibody;
∙ salivary amylase, an enzyme that begins starch digestion in the mouth; and
.ligual Lipase
amylase is an enzyme which function is to
hydrolyze or break starch to simple sugar with water
Roel of Intrinsic Salivary Glands
They secrete saliva at a fairly constant rate whether we are eat- ing or not, but in relatively small amounts. This saliva contains lingual lipase and lysozyme and moistens the mouth when we are not eating.
what are the glands in the extrinisic salivary glands and there roles
Parotid
submandibular
sublingual
what is responsible for the folds of the cavities in the digestive system
muscularis mucosae in the mucosa
largest fold of the small intestine are?
what is the role?
Semicircular pilcae which contain microvilli
the spin chyme to allow brush borders to become more efficient
What are the steps for insulin release
Pancrease detects high blood sugar through elevate atp
ATP closes leaky k+ channels elevates MP
B Cells release insulin and GABA
GABA blocks glucagon release by hyperpolarization
what products do gland acini add to saliva
amylase, lingual lipase, lysozyme and mucus
Role of pharynx
muscular funnel connects
oral cavity to the esophagus
nasal cavity to larynx
T/F The pharynx is where digestive and respiratory tracts intersect
True
where the esophagus penetrates the diaphragm is called
esophageal hiatus
Role of the Lower esophageal sphincter (LES)
prevents stomach contents from regurgitating into the esophagus, thus protecting the esophageal mucosa from the erosive effect of stomach acid.
failure of the Lower esophageal sphincter/cardiac sphincter can lead to
Heartburn
esophageal glands are located where in the esophagus?
submucosae
whats the name of swallowing and the 3 phases of
swallowing also known as deglutition
phase one oral phase
phase two pharyneal phase
phase three esophageal phase aka perisastalsis
whats the name of swallowing and the 3 phases of
swallowing also known as deglutition
phase1 oral phase
phase2pharyngeal phase
phase 3 esophageal phase aka peristalsis
In what phase of deglutition is breathing suspended
pharyngeal phase
Peristalsis is controlled jointly by what parts of the CNS?
Brainstem and Myenteric plexus