Blood returns to the heart due to the residual forces given to blood during the ejection from heart and the suction force of the chest, which normall

Blood return to the heart

Blood returns to the heart due to the residual forces given to blood during the ejection from heart and the suction force of the chest, which normally has a negative (relative to atmospheric) pressure.

An important factor in the blood return to the heart is a contraction of skeletal muscles, which are also called the peripheral heart. When a person moves, the skeletal muscles contract and squeeze the veins of the limbs and torso, pushing blood in them toward the heart. Veins have valves which prevent the reverse movement of blood through the vessel (diagram 63).

People who lead a sedentary life and do not train their body can suffer from heart failure. After all, they deprive their heart of assistance from skeletal muscles. Taken from http://worldofschool.org

Diagram 63. Vein valve (1)
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Questions:
  • Explain the mechanism of blood returning to the heart.