Gastrointestinal System Flashcards
List the 2 functions of the digestive tract
Digestion which allows food to be processed and absorption which allows nutrients to be transferred through the blood stream
List the accessory organs in digestive tract
Salivary glands
Gallbladder
Liver
Pancreas
What substance do salivary glands secrete
Serous = watery secretion
Mucosa = thicker secretion
Mixed seromucus = mixed watery and thicker secretion
What is the function of saliva
Buffers the mouth and aids in tooth structure and taste whilst protecting the surface of mouth
Describe the function of the gallbladder
Stores bile and concentrates it
List one of the main functions of the liver
Produces bile which helps with fat digestion
What is the small intestine composed of
Jejunum, duodenum, and ileum
What is the large intestine composed of
Caecum, ascending colon, transverse, descending colon, rectum and anus
Where does the initial part of digestion take place
Stomach where food is mixed and churned
What lines the interstitial organs
Mucosa
Name the outer most layer of the GI tract
Serousa
In the GI tract, name the layer found underneath serosa layer
Longitudinal muscle
What structure is located between the longitudinal muscle layer and circular muscle layer
Myenteric plexus
Name the layer which is deep to the circular muscle
Submucosa
Name the plexus which is located between the submucosa and muscularis mucosae
Submucosal plexus
Name the layer which is deep to muscularis muscosae
Mucosa
Describe lamina propria
This is formed of loose connective tissue and lies beneath epithelium
Name the connective tissue layer in the GI tract which lies beneath the epithelium
Lamina propria
What substance does lamina propria contain
Inflammatory cells which provide support and nutrients to the overlying epithelia
Inflammatory cells are found in which layer of the connective tissue in the GI tract
Lamina propria
What is muscularis mucosae composed of
Smooth muscle which continues down the length of GI tract
Which layer lies deep to muscularis mucosae
Submucosa
Describe the composition of Submucosa
Dense irregular connective tissue which contains many blood vessels, nerves and lymphatic vessels
Describe the structure of muscularis propria
It’s composed of circular muscle (inner) and longitudinal muscle ( outer)
Explain the function of muscle forming muscularis propria
The inner circular and outer longitudinal muscle allows for peristalsis of food products and nutrients
Name the superficial layer covering the organs
Adventitia
Name the 2 nerve plexuses found in GI tract
Meisseners
Auerbach
What are Meisseners and Auerbach
2 nerve plexuses found in the GI tract
Describe the function of Bruner glands
Secrete biocarbonate ions which helps neutralise acid from stomach
Name the glands which help neutralise acid in the stomach and secrete biocarbonate
Bruner glands
Describe the function of Peyer’s patches
Lymphoid follicle that form part of the immune system thus preventing production and growth of harmful bacteria
Which structure helps to prevent growth of harmful bacteria and function as lymphoid follicles
Peyer’s patches