A type of lipoprotein that is considered to be a "good" cholesterol is

A. Bradypnea and slow heart rate is incorrect because pulmonary embolism (PE) usually triggers tachypnea and tachycardia, not slow breathing or bradycardia. These responses occur as the body attempts to compensate for hypoxemia and reduced pulmonary blood flow.

B. Bilateral peripheral edema and generalized weakness is incorrect because bilateral leg swelling is more characteristic of heart failure or systemic venous congestion. While a PE may result from deep vein thrombosis (DVT), edema is usually unilateral and not the defining manifestation of an acute PE.

C. Sudden onset of dyspnea and sharp chest pain is correct because a pulmonary embolism occurs when a blood clot obstructs a pulmonary artery, causing abrupt impairment of blood flow to the lung. This leads to sudden shortness of breath, sharp or pleuritic chest pain (worsening with inspiration), tachypnea, and sometimes hemoptysis. Other signs may include anxiety, diaphoresis, and hypoxemia. Rapid recognition is essential, as PE can be life-threatening if untreated.

D. Gradual onset of a productive cough with thick sputum is incorrect because this pattern is more typical of pneumonia or chronic bronchitis, not pulmonary embolism. PE symptoms are typically acute and sudden rather than gradual.

A. Third-degree (full-thickness) is incorrect because third-degree burns extend through the entire epidermis and dermis and may involve underlying tissues such as fat, muscle, or bone. These burns are typically painless due to nerve destruction and often appear white, leathery, or charred. Blisters are usually absent because the dermis is destroyed.

B. Second-degree (partial thickness) is incorrect because second-degree burns involve the epidermis and part of the dermis. They are characterized by redness, blistering, and severe pain. Partial-thickness burns may be superficial or deep depending on how much of the dermis is affected.

C. Fourth-degree (full-thickness) is incorrect because fourth-degree burns extend beyond the skin into underlying tissues, including muscle, tendon, or bone. These burns are severe, often painless due to nerve destruction, and require surgical intervention.

D. First-degree (superficial) is correct because first-degree burns affect only the epidermis. They cause redness, mild swelling, and pain, but blisters are absent. Common causes include mild sunburn or brief contact with hot objects. First-degree burns typically heal within 3–7 days without scarring, as only the outermost layer of skin is damaged.