Jessica, a 20-year-old college student, scraped her knee while jogging. The area became red, warm, swollen, and painful over the next several hours. Three days later, yellow drainage appeared from the wound, and a healthcare provider diagnosed a bacterial infection. Jessica is confused because she thought inflammation and infection were the same thing. Which of the following statements is true?

Dev is a 19-year-old male who presents with persistent pain and swelling in his left distal femur that has gradually worsened over several months. Imaging reveals a destructive bone lesion, and biopsy confirms osteosarcoma. A chest CT identifies several small nodules in both lungs. The healthcare team explains that the cancer originated in connective tissue and that the lung findings may represent metastatic disease. The patient’s family asks why a biopsy was necessary when imaging had already identified the bone lesion. What is the best response?

Homira is a  56-year-old woman who presents with redness, warmth, swelling, and tenderness of her lower leg after sustaining a small cut while gardening. The area of erythema has expanded over the last 24 hours. Her temperature is 100.9°F (38.3°C), heart rate is 108 bpm, and laboratory results reveal leukocytosis. The provider outlines the border of the redness with a marker before initiating antibiotic therapy. The patient’s swelling is primarily caused by:

Mr. Rodriguez is a 67-year-old man with obesity, hypertension, and a history of elevated cholesterol levels. While walking up the stairs at home, he develops shortness of breath and severe chest pressure that radiates to his left arm. Cardiac imaging reveals a significant blockage in a coronary artery. Laboratory findings later indicate myocardial tissue death due to inadequate oxygen delivery. What is the most common type of necrosis associated with myocardial infarction (heart attack)?

Maria is a 67-year-old woman who underwent a hip replacement surgery. Three days after the procedure, she develops a fever, redness around her incision, and purulent drainage from the surgical site. She reports feeling tired and having increased pain at the incision. The healthcare provider orders a complete blood count (CBC) and diagnoses a bacterial infection acquired during her hospital stay. Which assessment finding provides the strongest evidence of a surgical site infection?

The next 5 questions are about Juan. 

Lilith is 42-year-old woman who undergoes routine cervical screening. Biopsy reveals atypical epithelial cells confined above the basement membrane. Her healthcare provider explains that the lesion has not invaded surrounding tissues and can potentially be cured through removal. The patient wants to understand her risk if the lesion is not treated. Which sequence best represents malignant transformation?

Mark, a 55-year-old man, has smoked one pack of cigarettes daily for 30 years. During a routine examination, his physician explains to him that over time, smoking can cause the cells in the breathing passages to change and become unhealthy. A biopsy shows abnormal cellular organization, but the cells have not yet become cancerous. Mark wants to understand whether these changes could eventually lead to cancer. The biopsy revealed abnormal cell size, shape, and organization. Why are these changes considered clinically significant?

Maria is a 67-year-old woman who underwent a hip replacement surgery. Three days after the procedure, she develops a fever, redness around her incision, and purulent drainage from the surgical site. She reports feeling tired and having increased pain at the incision. The healthcare provider orders a complete blood count (CBC) and diagnoses a bacterial infection acquired during her hospital stay. Which statement best explains why Maria’s infection can be classified as both nosocomial and iatrogenic?  

The first 5 questions are about Maria.