What is the primary function of the large intestine in digestion?

Correct Answer: C

Rationale: The correct answer is C: Water absorption and feces formation. The primary function of the large intestine is to absorb water from the undigested food material and form feces. This process helps in maintaining the body's water balance and producing solid waste for excretion. The large intestine does not primarily absorb nutrients like the small intestine (Choice A), nor does it digest proteins (Choice D). Choice B is irrelevant and does not describe the main function of the large intestine in digestion.

Correct Answer: C

Rationale: The correct action is C: Manually remove the impacted stool. This is the first priority to relieve the impaction causing incontinence. Administering laxatives (choice A) may worsen incontinence. Assisting the patient to sit on the toilet (choice B) will not address the impaction. Increasing oral fluid intake (choice D) may help prevent future impactions but will not address the urgent need to relieve the current impaction.

Correct Answer: A

Rationale: The correct answer is A: tongue. The frenulum is a small fold of tissue that connects the tongue to the floor of the mouth. This attachment helps with the movement and function of the tongue during activities such as speaking and eating. Choices B, C, and D are incorrect because the frenulum is not associated with the stomach, lips, or liver in the human anatomy. The specific location and function of the frenulum on the tongue make choice A the correct answer in this context.

Correct Answer: C

Rationale: The correct answer is C: pepsin. Pepsin is an enzyme that works in the stomach to break down proteins. It is not active in the duodenum because the duodenum is the first part of the small intestine where the acidic chyme from the stomach is neutralized by bicarbonate and digestive enzymes including amylase, enterokinase, and nuclease become active. Amylase breaks down carbohydrates, enterokinase activates trypsinogen, and nuclease breaks down nucleic acids. Thus, pepsin is the correct answer as it is not active in the duodenum, unlike the other enzymes listed.

Correct Answer: B

Rationale: Step 1: Water-soluble vitamins dissolve in water, are not stored in the body, and need to be replenished daily. Step 2: Vitamin C fits these criteria as it dissolves in water, is not stored in the body, and needs daily intake. Step 3: Vitamin D, E, and K are fat-soluble vitamins, stored in the body, and do not need daily replenishment. Summary: Choice B (Vitamin C) is the correct answer as it is water-soluble, while choices A (Vitamin D), C (Vitamin E), and D (Vitamin K) are fat-soluble vitamins and do not meet the criteria of water solubility.