Which of the following is a major site of nutrient absorption?

Correct Answer: B

Rationale: The correct answer is B: jejunum. The jejunum is a major site of nutrient absorption in the small intestine due to its extensive surface area and presence of villi and microvilli that facilitate absorption of nutrients like carbohydrates, proteins, and fats. The duodenum primarily functions in digestion, the ileum mainly absorbs vitamin B12 and bile salts, and the colon absorbs water and electrolytes. Therefore, the jejunum is the correct choice for being a major site of nutrient absorption.

Correct Answer: A

Rationale: The correct answer is A: "I will lie on my left side to sleep at night." This position helps prevent acid from flowing back into the esophagus due to the angle of the stomach in relation to the esophagus. Lying on the right side can worsen reflux. Sleeping on the back with the head flat can also worsen symptoms as gravity can allow acid to flow back up. Sleeping on the stomach with the head flat is not recommended as it can put pressure on the stomach, leading to increased reflux.

Correct Answer: B

Rationale: The correct answer is B: Lying on the left side with knees bent. This position allows for better visualization and access to the colon during the colonoscopy procedure. By lying on the left side, the client's colon is in a more optimal position for the scope to navigate through the colon. Additionally, bending the knees helps to relax the abdominal muscles and make the procedure more comfortable for the client. Incorrect choices: A: Lying on the right side with legs straight - This position does not provide optimal access to the colon and may make the procedure more difficult. C: Prone with the torso elevated - This position is not suitable for a colonoscopy as it does not allow for proper access to the colon. D: Bent over with hands touching the floor - This position is not recommended for a colonoscopy as it is not conducive to the procedure and may cause discomfort for the client.

Correct Answer: C

Rationale: The correct answer is C: simple columnar epithelium. This type of epithelium is found in the stomach, small intestine, and large intestine. Simple columnar epithelium is ideal for absorption and secretion due to its tall, column-like shape and presence of microvilli. It provides a large surface area for nutrient absorption. Simple squamous epithelium (choice A) is thin and is found in areas where filtration or diffusion occurs, like the lungs. Stratified squamous epithelium (choice B) is found in areas subject to mechanical stress, such as the skin. Pseudostratified columnar epithelium (choice D) is typically found in the respiratory tract and has cilia for moving mucus.

Correct Answer: A

Rationale: The correct answer is A: moist stratified squamous epithelium. The lips require a moist lining to prevent dehydration and facilitate movement. Stratified squamous epithelium is ideal for areas subjected to wear and tear, like the lips. The stratified nature provides protection, while the squamous cells allow flexibility and ease of movement. The moist aspect is crucial to maintain hydration and prevent drying out. Summary: - Choice B (dry stratified squamous) is incorrect because the lips need a moist lining. - Choice C (simple columnar) is incorrect because columnar epithelium is not typically found on the lips. - Choice D (pseudostratified columnar) is incorrect as it is not the most suitable type of epithelium for the lips' functions.