Your heart is located between your lungs in the middle of your chest, behind and slightly to the left of your breastbone (sternum). A double-layered membrane called the pericardium surrounds your heart like a sac.he heart weighs between 7 and 15 ounces (200 to 425 grams) and is a little larger than the size of your fist. By the end of a long life, a person's heart may have beat (expanded and contracted) more than 3.5 billion times.
There are 320 calories in 1 serving of Pei Wei Mongolian Beef. Calorie breakdown: 47% fat, 28% carbs, 25% protein.
Macronutrients. A 4-ounce serving of extra-lean ground beef contains 260 calories, along with 21 grams of protein and 20 grams of fat, including 8 grams of saturated fat.The same serving of regular ground beef contains 350 calories, along with 19 grams of protein and 30 grams of fat, including 12 grams of saturated fat.round beef is a good source of vitamin B-12, zinc, niacin, riboflavin, phosphorus, vitamin B-6 and iron. It also provides you with smaller amounts of thiamine, riboflavin and folate.