Gastrointestinal Tract Structures and Functions

Every question here, with the answer

1. A patient reports that during periods of high stress, bowel movements become delayed and stool is harder to pass. Which explanation by the nurse best connects this symptom to GI nervous system control?

   1. Stress activates the parasympathetic nervous system, which slows fecal movement through the intestines.
   2. Stress causes the pyloric sphincter to release chyme too quickly into the small intestine.
   3. Stress can activate the sympathetic nervous system, decreasing peristalsis and increasing anal sphincter constriction.
   4. Stress causes the jejunum to stop absorbing nutrients, which directly prevents defecation.

   Answer: Stress can activate the sympathetic nervous system, decreasing peristalsis and increasing anal sphincter constriction.

   The section states that sympathetic activation inhibits bowel motility and increases sphincter tone, which can make stool harder to pass. The parasympathetic system has the opposite effect, and the other options focus on absorption or chyme movement rather than the stress-related elimination response.

2. The nurse is teaching a patient how the GI tract mechanically moves and breaks down food before elimination. Which examples should the nurse include? Select all that apply.

   1. Muscular contractions in the stomach churning food with gastric juices
   2. Chewing food in the mouth into smaller particles
   3. Gastric acid and pepsin breaking down proteins
   4. Salivary amylase starting carbohydrate breakdown
   5. Peristalsis propelling food along the GI tract

   Answer: Muscular contractions in the stomach churning food with gastric juices, Chewing food in the mouth into smaller particles, Peristalsis propelling food along the GI tract

   Chewing, stomach churning, and peristalsis are mechanical processes described in the section. Salivary amylase, gastric acid, and pepsin are examples of chemical digestion rather than mechanical digestion.

3. A patient asks where most nutrients from digested food enter the bloodstream. Which response by the nurse is most accurate?

   1. The rectum absorbs most nutrients before feces are eliminated.
   2. The cecum is the main site where digested nutrients move directly into the bloodstream.
   3. The jejunum and ileum of the small intestine are primarily responsible for nutrient absorption into the bloodstream.
   4. The stomach body absorbs most carbohydrates, proteins, fats, vitamins, and minerals.

   Answer: The jejunum and ileum of the small intestine are primarily responsible for nutrient absorption into the bloodstream.

   The section identifies the small intestine, especially the jejunum and ileum, as the primary site of nutrient absorption. The stomach mainly digests and forms chyme, while the large intestine and rectum are more focused on water/electrolyte absorption, feces storage, and elimination.

4. A nurse is reinforcing teaching for a patient who will have an ostomy for bowel elimination. Which statements are consistent with this section? Select all that apply.

   1. An ileostomy is created from the ileum.
   2. A colostomy uses a section of the colon to form the stoma.
   3. A stoma typically appears moist and pink to red.
   4. An ostomy is always permanent.
   5. Waste products are collected in a pouch attached to the abdomen.

   Answer: An ileostomy is created from the ileum., A colostomy uses a section of the colon to form the stoma., A stoma typically appears moist and pink to red., Waste products are collected in a pouch attached to the abdomen.

   The section describes colostomy, ileostomy, typical stoma appearance, and pouch collection of diverted waste. It also states that an ostomy may be permanent or temporary, so it is incorrect to teach that it is always permanent.

5. A patient states, “I feel the urge to have a bowel movement, but I want to wait until I get to the bathroom.” Which GI function allows voluntary regulation of defecation?

   1. The stomach stores feces until the patient decides to defecate.
   2. The external anal sphincter allows conscious control over initiation and regulation of defecation.
   3. The pyloric sphincter relaxes to allow feces into the anal canal.
   4. The internal anal sphincter is under conscious control and holds stool voluntarily.

   Answer: The external anal sphincter allows conscious control over initiation and regulation of defecation.

   The section states that the external anal sphincter is under conscious control, allowing voluntary initiation and regulation of defecation. The rectum stores feces, the internal anal sphincter relaxes reflexively, and the pyloric sphincter controls chyme release from the stomach to the small intestine.

6. A nurse is explaining why the colon is important in maintaining hydration and forming stool. Which statement best reflects the colon’s role?

   1. The colon converts pepsinogen to pepsin to begin protein digestion.
   2. The colon secretes bile to neutralize acidic chyme before elimination.
   3. The colon uses villi and microvilli to absorb most carbohydrates, proteins, fats, vitamins, and minerals.
   4. The colon absorbs water and electrolytes from waste material as feces gradually become more solid.

   Answer: The colon absorbs water and electrolytes from waste material as feces gradually become more solid.

   The section explains that the colon absorbs water and electrolytes from waste, transforming it into solid feces. Bile activity occurs in the small intestine, villi and microvilli are emphasized in the small intestine, and pepsin-related protein digestion occurs in the stomach.