Correct Answer: D

Rationale: The correct answer is D because confirming the insertion site and direction using imaging guidance ensures precise placement of the chest tube, minimizing the risk of complications. Imaging guidance allows the nurse to visualize the exact location of the pneumothorax and guide the tube insertion accurately. A: Positioning the patient in a semi-Fowler's position with arms elevated may be beneficial for comfort but does not directly ensure proper chest tube placement. B: Marking the insertion site with a pen may help as a reference point but does not guarantee accurate placement. C: Administering analgesia is important for the patient's comfort but does not impact the placement of the chest tube. In summary, choice D is the most critical step to ensure the chest tube is correctly placed and effectively treats the pneumothorax.

Correct Answer: C

Rationale: The correct answer is C: unfreezing. Unfreezing is the initial stage in Lewin's planned change model where individuals become open to change by recognizing the need for it. During this stage, the nurse identifies the need for change, plans strategies to implement it, and works on overcoming resistance by ensuring that the driving forces (reasons for change) outweigh the restraining forces (barriers to change). Refreezing (A) is the final stage where the changes are reinforced and integrated into the organization. Movement (B) is the stage where actual change occurs, and in activism (D) is not a recognized stage in Lewin's model.

Correct Answer: B

Rationale: In this scenario, the pregnant woman is presenting with severe abdominal pain, passage of tissue, and cervical dilation with products of conception protruding through the cervical os at 12 weeks gestation. These are classic signs and symptoms of an incomplete abortion. Incomplete abortion occurs when not all of the products of conception are expelled from the uterus. It can present with vaginal bleeding, abdominal pain, cervical dilation, and passage of tissue. The management of incomplete abortion may involve expectant, medical, or surgical options depending on the clinical context and the patient's condition.

Correct Answer: D

Rationale: The correct answer is D: Teeth. Teeth are responsible for the initial mechanical breakdown of food during mastication. Step 1: Teeth use their hard surfaces to chew and grind food into smaller pieces. Step 2: This process increases the surface area of the food, making it easier for digestive enzymes to break down. Step 3: The tongue aids in moving the food around the mouth but does not break down the food mechanically. Pharynx is responsible for swallowing, not mastication. Salivary glands produce saliva that helps in the lubrication and digestion of food, but they do not directly participate in the mechanical breakdown of food.

Correct Answer: C

Rationale: The correct answer is C: Malpractice. Malpractice refers to professional negligence or failure to perform duties according to accepted standards of practice. In this scenario, the surgeon's act of cutting the patient's bladder during an appendectomy could be considered a breach of duty and failure to provide the expected standard of care, which falls under malpractice. Battery (A) involves intentional harmful or offensive contact without consent. Negligence (B) is the failure to exercise reasonable care, but in this case, it was more than just a lack of care. Tort (D) refers to a civil wrong that causes harm, but malpractice is a specific type of tort related to professional negligence.