Dr. Ackerman needs to more clearly see the blood flow through the heart of one of her patients. What should the patient do to make it easier for Dr. Ackerman to identify any blood flow problems in his heart?

The best way is to swollow and hold in your breath

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.