PT 4 GI Flashcards
What organs/things make up the digestive tract 10
- Mouth
- Esophagus
- Stomach
- Small intestine
- Large intestine
- Rectum
- Anus
- Liver
- Pancreas
- Gallbladder
What should I remember about the mouth
- Mastication - oral cavity has teeth used for chewing
- Deglutition - swallowing
- Buccal - Lips and the oral cavity
What should I remember about the esophagus
- Hollow muscular tube, which receives food from the pharynx and moves it to the stomach
- Peristaltic movements push the food down
What are the two sphincters for the esophagus
- Upper esophageal sphincter (UES) - allows the bolus to enter the esophagus from the mouth
- Lower esophageal sphincter (LES) - controls the opening to the stomach (stops gastric acid from entering the esophagus)
Does the stomach do a lot of absorption
No - it only absorbs a small amount of water, alcohol, electrolytes and certain drugs
What are the 3 main parts of the stomach
- Fundus (cardia)
- Body (corpus)
- Antrum
What stops the stomach contents from entering into the small intestine
The pyloric sphincter
What 3 cells are essential for the stomach
- Mucous cells
- Parietal cells (secrete hydrochloric acid, water and intrinsic factor(promotes vitamin B12 absorption in the small intestine))
- Chief cells (secrete pepsinogen)
What is the largest internal organ in the body
The liver
How many lobes does the liver have
Two - left and right.
What do the Kupffer cells in the liver do
They carryout phagocytic activity by removing bacteria and toxins from the blood (they detoxify)
What do the hepatic cells in the liver do
They make bile
What are the major functions of the liver
- Absorption and metabolism of nutrients
- Degradation of toxins, hormones and medications
- Synthesis of proteins
What are the 3 parts of the pancreas
- Head
- Body
- Tail
What are the functions of the pancreas
- Exocrine - Produces and releases enzymes
- Endocrine - Secrets insulin and amylin for glucose regulation
Why do we have a gallbladder
To store and and secrete bile
When will the gallbladder release bile
When there is a presence of fat in the upper duodenum
What are the functions of the small intestine
Protein, carbohydrate and fat digestion and absorption
What are the 3 parts of the small intestine
- Duodenum
- Jejunum
- Ileum
What is the purpose of villi
To produce digestive enzymes and increase the surface area for digestion and absorption
What is the function of goblet cells in the small intestine
To secrete mucus and protect the mucosa
What is the most important function of the large intestine
Water and electrolyte absorption
Besides water and electrolyte absorption, what is also important for the large intestine to do
Produce vitamin K and some B vitamins, and breaking proteins that are not digested or absorbed in the small intestine down into amino acids
What is the purpose of the ANS and the GI tract
- Parasympathetic (cholinergic) excites the tract and gets things moving
- Sympathetic (adrenergic) inhibits the tract to slow things down