The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is ...

Anatomy of the Heart . Your heart is made up of several chambers, valves, layers, ... The heart muscle is about the size of a fist and has the shape of an upside-down cone.

The formation of the heart depends on critical signals exchanged between its two main layers: the myocardium (the muscle that powers the heartbeat) and the endocardium (the inner lining of the heart).

The FDA has updated labels on the top two COVID-19 vaccines to warn of a rare heart side effect, mostly seen in young men.

Learn about the anatomy of the heart and how its chambers, valves, and vessels work together to maintain effective blood circulation throughout the body to sustain life.

The formation of the heart depends on critical signals exchanged between its two main layers: the myocardium (the muscle that ...

Cardiac tamponade is when fluid collects around the heart muscle, for instance, due to trauma. It puts strain on the heart and stops it working effectively. Symptoms include a drop in blood ...

Ischaemic heart disease, or a lack of blood supply to the heart muscle, is known to be the biggest single contributor to the number of heart failure patients.

Fascia: A layer of connective tissue that plays an active role in the body. It supports tissues and organs, lessens friction, or eases muscle tension. Learn more in this guide.

What the heart is made of: Heart muscle tissue, also called cardiac muscle tissue. What makes the heart beat: Electrical signals. Average resting heart rate: 60 to 100 beats per minute (in adults) ...