Biology News
Smithsonian Conservation Biology Institute - Atlas Obscura


Atlas Obscura
Smithsonian Conservation Biology Institute. This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats. Suggest an Edit · Add A Photo. Been Here? 0. Want to Visit? 1. Add Smithsonian Conservation Biology Institute to a New List ...

Ellen Pompeo on 'Grey's Anatomy' Pay Dispute: Catt Sadler, Debra Messing and More Celebs React - Us Weekly


Us Weekly
The stars are rallying behind Ellen Pompeo after the actress unveiled equal pay disputes she has faced while working on Grey's Anatomy. As previously reported, the Emmy winner, 48, spoke candidly about advocating for a salary that paralleled costar ...

C of I science standouts receive travel grant for national toxicology conference - College of Idaho News


College of Idaho News
This March, the 2018 Annual Meeting of the Society of Toxicology will attract thousands of toxicologists from around the globe to San Antonio, Texas. Billing itself as “the preeminent toxicology conference in the world,” the SOT meeting will feature ...

Texas Heart Institute: Heart Anatomy

Houston, Texas - United States

The 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. In fact, each day, the average heart beats 100,000 times, pumping about 2,000 gallons (7,571 liters) of blood.

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. The outer layer of the pericardium surrounds the roots of your heart's major blood vessels and is attached by ligaments to your spinal column, diaphragm, and other parts of your body. The inner layer of the pericardium is attached to the heart muscle. A coating of fluid separates the two layers of membrane, letting the heart move as it beats, yet still be attached to your body.

Your heart has 4 chambers. The upper chambers are called the left and right atria, and the lower chambers are called the left and right ventricles. A wall of muscle called the septum separates the left and right atria and the left and right ventricles. The left ventricle is the largest and strongest chamber in your heart. The left ventricle's chamber walls are only about a half-inch thick, but they have enough force to push blood through the aortic valve and into your body.

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