A28-year-old female presents to the er complaining of severe chest pain that worsens with respirations or lying down. she has a fever, tachycardia, and a friction rub. the most likely cause of these symptoms is:

ANSWER:

The most likely cause of the symptoms mentioned can be the result of the "swelling or irritation of the pericardium" which is a thin "sac-like membrane" that surround the heart.

EXPLANATION:

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.