Which cells differentiate and produce antibodies?  

A 25-year-old woman reports episodes where she wakes up during the night, feeling unable to move or speak. She is fully aware of her surroundings and can recall the event in detail the next day. During which sleep stage does this type of parasomnia occur?

A patient is diagnosed with obstructive shock. Which of the following is most likely the underlying cause? 

A 38-year-old woman presents to the emergency department with diffuse, cramping abdominal pain that started a few hours ago. She also reports nausea and feels her pain is deep and difficult to pinpoint. The pain intermittently worsens and is associated with a slow heart rate and sweating. Based on this presentation, which type of pain is the patient most likely experiencing?

Which of the following mechanisms primarily leads to hypoxemia in restrictive lung disorders?

A 55-year-old male patient with a history of mitral valve prolapse presents with fever, fatigue, and joint pain. You notice tender, raised reddish-purple lesions on the pads of his fingers and toes. Which of the following conditions is most likely associated with these lesions?

A premature infant is born at 28 weeks gestation and shortly after birth develops difficulty breathing, grunting, and cyanosis. Despite efforts to ventilate, the infant’s oxygen levels remain low. Which of the following best explains the underlying cause of this infant’s condition?

A 30-year-old male presents to the emergency department with difficulty breathing and wheezing after exposure to pollen. His oxygen saturation is 92% on room air, and he is using accessory muscles to breathe. Arterial blood gas reveals mild hypoxemia. Pulmonary function tests show reduced airflow. Which of the following is the most likely cause of his low ventilation-perfusion (V/Q) ratio?

Four hours after mechanical ventilation is initiated, a patient’s arterial blood gas (ABG) results include a pH of 7.51, PaO2 of 88 mm Hg, PaCO2 of 26 mm Hg, and HCO3− of 23 mEq/L (23 mmol/L). What change should the nurse anticipate to the ventilator settings to fix the acid-base imbalance?

A patient with a history of myocardial infarction presents with fatigue, shortness of breath, and exercise intolerance. An echocardiogram shows an ejection fraction (EF) of 35%. What is the most likely underlying mechanism for this patient’s condition?