Correct Answer: D

Rationale: The four main concepts common to nursing that appear in each of the current conceptual models are person, environment, health, and nursing. These concepts form the foundational principles that guide nursing practice and theory.

Correct Answer: C

Rationale: Immobility, diaphoresis, and avoidance of deep breathing or coughing are common signs of pain.

Correct Answer: C

Rationale: The supine position is ideal for abdominal inspection as it allows the healthcare provider to easily access and examine the abdomen. In the supine position, the patient lies flat on their back with arms at their sides, providing a clear view and access to the abdominal area for inspection.

Correct Answer: B

Rationale: Before administering a blood transfusion, it is crucial to perform blood typing and cross-matching to ensure compatibility between the donor's blood and the recipient's blood. This process helps prevent adverse reactions such as transfusion reactions, which can be life-threatening. Prothrombin and coagulation time, bleeding and clotting time, as well as CBC and electrolyte levels are important tests in other clinical contexts, but for blood transfusions, blood typing and cross-matching are essential to ensure patient safety.

Correct Answer: B

Rationale: The most effective form of universal precautions is to discard all used uncapped needles and syringes in an impenetrable protective container. This practice minimizes the risk of needle-stick injuries, which are a significant concern when dealing with used needles. By safely disposing of uncapped needles, healthcare providers can protect themselves and others from potential exposure to bloodborne pathogens.