Aorta To body 02-rich blood 02-poor blood From body Coronary artery (supplies ox

Question

Aorta To body 02-rich blood 02-poor blood From body Coronary artery (supplies oxygen to the heart muscle) Right ung Left ung Right atrium Valves Left atrium Valves Left Right ventricle entricle Dead muscle tissue Blockage From body Figure 2. Effects of a coronary artery blockage Figure 1. Blood flow through the human heart 1. The two sides of the heart show a considerable difference in the thickness of their walls. Which chamber has the thickest walls? Why? 2. What arteries supply the heart muscle with 02 and nutrients? What happens if these arteries become blocked?

Explanation / Answer

The two sides of heart have a considerable differences in thickness of walls.
The chamber with thickest walls is left ventricle.
The left ventricle has the thickest walls because it needs to be stronger as it is
the major pumping chamber in heart.
The thickness is due to variation in myocardium which inturn decides the amount of force each
chamber can exert.

Arteries which supply the heart muscle with oxygen and nutrients are coronary arteries.
When coronary arteries become blocked, then the less blood flow may result in heart pain
or an heart attack.

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