The greater the mass of tissue in an organ, the greater its need for an adequate blood supply. Which chamber of the heart has the highest probability of being the site of a myocardial infarction?

Left ventricle.

Explanation:

Left ventricle is the chamber of the heart that has to work against the highest resistance. Because it has to pump blood into the systemic circulation. moreover it has a greater muscle mass and is more thicker than the right chambers of the heart.

Thus, the oxygen demand of left ventricle is much more than that of the other three chambers. If by any means the blood supply to the heart is not sufficient to fulfill the oxygen demand of the left ventricular cells then it would result in myocardial infarction commonly termed as heart attack

the ems is the abbreviation for the emergency medical services. it is a service provided by a group of medical professionals specialised doctors and other healthcare staff.

any one can call 911 in case of any medical emergency and a group of health care professional will come and give the treatment required. every day the ems staff receive many phone call, which are related to different types of medical emergencies, out of which 25-28% are exclusively related to the respiratory issues.

so, the correct answer is 25-28%.