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The external structure of the Heart The heart is a muscular organ located between the lungs in the centre of the chest (thorax), and is about the size of a fist. It pumps blood continuously around the body. An organism can lose consciousness within just a few seconds if the brain is deprived of blood. The heart is made from cardiac muscle and is a dual pump. This means that blood flows around the body in 2 routes simultaneously - both to and back from the lungs (the pulmonary circuit) and at the same time to and back from the body (systemic circuit).

• The external structure of the Heart
• The heart is a muscular organ located between the lungs in the centre of the chest (thorax), and is about the size of a fist.
• It pumps blood continuously around the body. An organism can lose consciousness within just a few seconds if the brain is deprived of blood.
• The heart is made from cardiac muscle and is a dual pump. This means that blood flows around the body in 2 routes simultaneously - both to and back from the lungs (the pulmonary circuit) and at the same time to and back from the body (systemic circuit).