Which of the following cell types is primarily responsible for presenting antigens to T cells during the immune response?

Correct Answer: C

Rationale: The correct answer is C: Macrophages. Macrophages are antigen-presenting cells that engulf pathogens and present their antigens to T cells, initiating an immune response. They express major histocompatibility complex (MHC) molecules necessary for T cell recognition. B cells also present antigens but primarily to B cells for antibody production. NK cells are involved in killing infected cells, not antigen presentation. Eosinophils are mainly involved in allergic responses and defense against parasites, not antigen presentation.

Correct Answer: A

Rationale: The correct answer is A: Rotator cuff tear. The presentation of acute shoulder pain and limited range of motion after a fall onto an outstretched hand, along with tenderness over the greater tuberosity and pain with passive abduction and external rotation, is classic for a rotator cuff tear. The mechanism of injury and physical exam findings are consistent with this condition. B: Glenohumeral dislocation typically presents with a visibly deformed shoulder and loss of normal shoulder contour. C: Acromioclavicular joint separation would present with tenderness over the AC joint rather than the greater tuberosity, and typically involves a history of direct trauma to the shoulder. D: Proximal humerus fracture would present with more diffuse shoulder pain and swelling, and not specific tenderness over the greater tuberosity.

Correct Answer: C

Rationale: The correct answer is C: Acquired von Willebrand syndrome. This condition is characterized by a defect in von Willebrand factor function, leading to prolonged bleeding time and mucocutaneous bleeding. Normal platelet count rules out Glanzmann thrombasthenia and Bernard-Soulier syndrome which are platelet disorders. Normal PT and aPTT rule out Hemophilia A, a coagulation factor deficiency. Acquired von Willebrand syndrome is the most likely cause based on the clinical presentation and laboratory findings.

Correct Answer: A

Rationale: The correct answer is A: Bleeding. Chemotherapy can lead to low platelet counts (thrombocytopenia), increasing the risk of bleeding. The priority goal of the nurse is to prevent bleeding by taking precautions such as avoiding invasive procedures, using soft toothbrushes, and monitoring for signs of bleeding. Infection (B) is important but not the priority as bleeding can be life-threatening. Hypotension (C) is not directly related to thrombocytopenia. Diarrhea (D) is a potential side effect of chemotherapy but is not the priority when considering thrombocytopenia.

Correct Answer: C

Rationale: In a postpartum client who presents with severe abdominal pain, nausea, and vomiting, it is crucial to assess for signs of peritonitis or surgical abdomen. These signs may include rebound tenderness, guarding, rigidity, and fever. Peritonitis is a serious condition that may require immediate surgical intervention. Administering antiemetic medication, encouraging clear fluids, or providing a heating pad may not address the underlying cause of the symptoms and delay appropriate treatment. Assessing for signs of peritonitis or surgical abdomen is crucial for prompt identification and management of the client's condition.

Correct Answer: C

Rationale: The correct answer is C: Durable power of attorney. This legal document allows Mr. M to appoint his daughter as his healthcare proxy, granting her the authority to make medical decisions on his behalf if he becomes incapacitated. A: Expressed contract involves clear terms agreed upon by both parties, not relevant here. B: Implied contract arises from actions rather than explicit agreement, not applicable in this situation. D: A living will outlines an individual's medical treatment preferences, but does not grant decision-making authority to another person.

Correct Answer: B

Rationale: The correct answer is B: Cleanse the bite with soap and running water. This is the first nursing intervention because it is crucial to prevent infection. Cleaning the bite area helps remove bacteria and debris, reducing the risk of infection. Injecting with rabies immune globulin (choice A) and rabies vaccine (choice C) should be done later as per protocol after assessing the situation. Administering pain reliever (choice D) is important but not the first priority in this scenario.

Correct Answer: B

Rationale: The correct answer is B: Administer opioid analgesics to alleviate abdominal pain and discomfort. Opioid analgesics are effective in managing severe pain associated with malignant bowel obstruction. By providing adequate pain relief, the patient's comfort and quality of life can be significantly improved. Choice A is incorrect because initiating bowel rest and maintaining the patient in a semi-Fowler's position may not effectively address the severe pain and discomfort experienced by the patient. Choice C is incorrect as surgical intervention in this scenario may not be appropriate or feasible due to the advanced stage of cancer and the presence of malignant bowel obstruction. Choice D is incorrect as antiemetic medications primarily target nausea and vomiting, which may not be the primary symptoms of concern in this case. Focusing on pain management should be the priority.

Correct Answer: D

Rationale: The correct answer is D: Diabetic retinopathy. This condition is a common complication of diabetes that occurs due to the thickening of capillaries and arterioles in the eye, leading to damage to the retina. This can result in vision problems and even blindness if left untreated. A: Papilledema is the swelling of the optic disc due to increased intracranial pressure, not related to diabetes. B: Glaucoma is a condition characterized by increased pressure within the eye, not directly caused by diabetes. C: Retinal detachment is the separation of the retina from the underlying tissues, which is not primarily caused by diabetes-related capillary changes.