the heart pt.5

Question 1

why is the left ventricle thicker than the right

Answer 1

The left ventricle of the heart has thicker, more muscular
walls than the right ventricle, because it needs to contract
powerfully to pump blood all the way round the body. The right
side only needs to get blood to the lungs, which are nearby.

Question 2

why are ventricles in general thicker than the atria

Answer 2

The ventricles have thicker walls than the atria, because they
have to push blood out of the heart whereas the atria just
need to push blood a short distance into the ventricles.

Question 3

what is the av valves job

Answer 3

The atrioventricular (AV) valves link the atria to the ventricles and
stop blood flowing back into the atria when the ventricles contract.

Question 4

what is the semi lunar valves job

Answer 4

The semi-lunar (SL) valves link the ventricles to the
pulmonary artery and aorta, and stop blood flowing
back into the heart after the ventricles contract