Nokea
Which of the following statements about fat and fat digestion/absorption is true?
- A. Fat soluble vitamins are incorporated into mixed micelles and absorbed directly across the microvillus cell membrane
- B. Triglycerides are resynthesized from fatty acids and monoglyceride in the intestinal epithelial cell and are exported directly into the portal circulation
- C. Pancreatic lipase functions best at a pH of 3
- D. None of the above
Correct Answer: D
Rationale: The correct answer is D because none of the statements are true. A is incorrect because fat-soluble vitamins are incorporated into chylomicrons before absorption. B is incorrect because triglycerides are resynthesized in the intestinal cell but packaged into chylomicrons, not directly exported. C is incorrect because pancreatic lipase functions best at a pH of around 7-8, not 3. So, the correct answer is D as all the other choices are incorrect.
You may also like to solve these questions
Where is the majority of absorption of nutrients in the digestive tract?
- A. stomach
- B. small intestine
- C. large intestine
- D. mouth
Correct Answer: B
Rationale: The majority of absorption of nutrients occurs in the small intestine. This is because the small intestine has a large surface area due to its villi and microvilli, which increase the absorption capacity. Additionally, the small intestine contains specialized cells that facilitate the absorption of nutrients into the bloodstream. In contrast, the stomach's main function is to break down food, the large intestine primarily absorbs water and electrolytes, and the mouth is responsible for initial digestion through chewing and saliva production. Therefore, choice B is correct as it aligns with the anatomical and physiological functions of the digestive system.
The projection from the posterior edge of the soft palate elevates and helps close off the nasopharynx when swallowing. The projection is called the
- A. buccal fat pad.
- B. epiglottis.
- C. uvula.
- D. palatine tonsil.
Correct Answer: C
Rationale: The correct answer is C: uvula. The uvula is a teardrop-shaped projection from the posterior edge of the soft palate that elevates during swallowing to help close off the nasopharynx, preventing food or liquids from entering the nasal cavity. The uvula's contraction is essential for proper swallowing function.
A: Buccal fat pad - located in the cheek area, not involved in swallowing or closing off the nasopharynx.
B: Epiglottis - a flap of tissue that covers the trachea during swallowing to prevent food from entering the airway, not related to closing off the nasopharynx.
D: Palatine tonsil - located on the sides of the throat, important for immune function but not directly involved in swallowing or closing off the nasopharynx.
A patient diagnosed with chronic hepatitis B asks about drug therapy to treat the disease. What is the most appropriate response by the nurse?
- A. Only chronic hepatitis C is treatable and primarily with antiviral agents and interferon.'
- B. There are no specific drug therapies that are effective for treating acute viral hepatitis.'
- C. Interferon combined with lamivudine (Epivir) will decrease viral load and prevent complications.'
- D. There are no drugs used for the treatment of viral hepatitis because of the risk of additional liver damage.'
Correct Answer: C
Rationale: For chronic hepatitis B, antiviral therapy such as interferon and lamivudine (Epivir) is used to reduce the viral load and prevent complications like cirrhosis.
Relating to carbohydrate digestion:
- A. Cellulose can be digested by human amylases
- B. It occurs only if bile salts are present
- C. third of starch digestion occurs in the mouth and two-thirds occurs in the small gut
- D. It can only occur in the complete absence of protein digestion
Correct Answer: B
Rationale: The correct answer is B because bile salts are essential for the digestion and absorption of fats, not carbohydrates. Cellulose cannot be digested by human amylases, making choice A incorrect. Starch digestion starts in the mouth with salivary amylase, not one-third in the mouth and two-thirds in the small gut, so choice C is incorrect. Carbohydrate digestion can occur simultaneously with protein digestion, so choice D is also incorrect. Bile salts aid in emulsifying fats, facilitating their digestion and absorption in the small intestine.
Which of these is a function of the large intestine?
- A. nutrient absorption
- B. bile production
- C. water absorption
- D. enzyme secretion
Correct Answer: C
Rationale: The correct answer is C: water absorption. The large intestine's main function is to absorb water and electrolytes from the indigestible food residue that enters it from the small intestine. This process helps in the formation of solid feces. Nutrient absorption primarily occurs in the small intestine (A). Bile production is done by the liver and stored in the gallbladder, not in the large intestine (B). Enzyme secretion primarily occurs in the small intestine and other digestive organs, not in the large intestine (D). Therefore, C is the correct answer as it aligns with the main function of the large intestine.