Chapter 49 Gastrointestinal Problems Part 1 Flashcards
(456 cards)
What are the primary functions of the gastrointestinal (GI) system?
Process food substances, absorb products of digestion into the blood, excrete unabsorbed materials, provide an environment for microorganisms to synthesize nutrients
Microorganisms synthesize nutrients such as vitamin K.
What is the role of intrinsic factor in the GI system?
Necessary for the absorption of vitamin B12
Intrinsic factor is produced by parietal cells in the stomach.
What controls gastric acidity in the stomach?
Gastrin
Gastrin is a hormone that stimulates the secretion of gastric acid.
What are the three parts of the small intestine?
- Duodenum
- Jejunum
- Ileum
Each part has specific lengths and functions in digestion.
What is the length of the duodenum?
8 to 10 inches (20 to 25 cm)
The duodenum is attached to the distal end of the pylorus.
What is the function of the jejunum?
About 8 feet (2.5 meters) long
The jejunum is involved in nutrient absorption.
What is the length of the ileum?
About 12 feet (3.7 meters) long
The ileum terminates in the cecum.
What is the role of saliva in digestion?
Contains the enzyme amylase (ptyalin)
Amylase aids in the digestion of starch.
What does amylase do?
Digests starch to maltose
Amylase is present in saliva.
What is the function of maltase in the digestive system?
Reduces maltose to monosaccharide glucose
Maltase is an enzyme produced in the small intestine.
What does lactase split lactose into?
Galactose and glucose
Lactase is essential for lactose digestion.
What is the function of sucrase?
Reduces sucrose to fructose and glucose
Sucrase facilitates the digestion of sugars.
What do nucleases do?
Split nucleic acids to nucleotides
Nucleases are enzymes found in pancreatic intestinal juice.
What is the role of enterokinase?
Activates trypsinogen to trypsin
Enterokinase is secreted in the small intestine.
What is the length of the large intestine?
About 5 feet (1.5 meters) long
The large intestine absorbs water and eliminates wastes.
What are the four parts of the colon?
- Ascending colon
- Transverse colon
- Descending colon
- Sigmoid colon
The colon also includes the rectum.
What is the function of the lower esophageal (cardiac) sphincter?
Prevents reflux of gastric contents into the esophagus
This sphincter helps maintain a one-way flow of food.
What regulates the rate of stomach emptying into the small intestine?
Pyloric sphincter
The pyloric sphincter allows food to exit the stomach gradually.
What is the function of hydrochloric acid in the stomach?
Kills microorganisms, breaks food into small particles, facilitates gastric enzyme activation
Hydrochloric acid is a key component of gastric juice.
What is pepsin’s role in gastric juice?
Converts proteins into proteoses and peptides
Pepsin is the chief coenzyme of gastric juice.
What does the peritoneum do?
Lines the abdominal cavity and forms the mesentery that supports the intestines and blood supply
The peritoneum plays a crucial role in organ support and protection.
What are some risk factors associated with the gastrointestinal system?
- Allergic reactions to food or medications
- Cardiac, respiratory, and endocrine disorders
- Chronic alcohol use
- Chronic high stress levels
- Chronic laxative use
- Chronic use of NSAIDs
- Diabetes mellitus
- Family history of gastrointestinal disorders
- Long-term gastrointestinal conditions
- Neurological disorders
- Previous abdominal surgery or trauma
- Tobacco use
These factors can lead to various gastrointestinal issues, including constipation and increased risk of cancer.
What is the largest gland in the body and its weight range?
The liver, weighing 3 to 4 pounds (1.4 to 1.8 kg)
The liver plays a crucial role in various bodily functions.