1. What Blood Pressure Is

How Your Heart Functions Your heart. It’s about the size of your fist, and it weighs only about eight to 10 ounces. It’s composed of two upper chambers (the left and right atria) and two lower chambers (the left and right ventricles) that work in unison. On average, your heart contracts and relaxes—what we know […]


Leave a Reply

Enter Your Log In Credentials
This setting should only be used on your home or work computer.