When blood returns to the heart, it follows a complicated pathway. If you were in the bloodstream, you would follow the steps below one by one. Oxygen-poor blood (shown in blue) flows from the ...

Your heart is an amazing organ. It continuously pumps oxygen and nutrient-rich blood throughout your body to sustain life. This fist-sized powerhouse beats (expands and contracts) 100,000 times ...

the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic). The system is responsible for the flow of blood, nutrients, oxygen and other gases ...

Keywords heart anatomy, fluorography, venous catheterization, blood flow, cardiac cycle, right atrium, left atrium, coronary arteries, selective opacification, physiological data Email us at ...

A person should call 911 or seek emergency care immediately if they experience signs or symptoms of a heart attack. Prompt treatment is crucial to restoring blood flow to the heart. The heart is a ...

The four valves of the heart allow blood to flow through the heart in the right direction. The valves open or close each time the heart beats. Problems with the heart valves can lead to ...

A Leonardo diagram showing the heart and its blood ... of how the arterial valves close and open - letting blood flow around the heart - holds true today, but is not widely known.