Anatomy of the Heart. Video. Heart Shape and Make-up . Nine (9) inches long x three (3) inches wide. Size of a fist Triangular Involuntary striated muscle tissue Only found in this organ. Beats 60-100 times per minute 2.5 billion times during an average lifespan. .
Vessel transporting oxygen-rich blood
from the lungs to the left atrium
A common misconception is that all
veinscarry de-oxygenated blood
it is more appropriate to classify veins as vessels carrying blood to the heart