Question

The diagram below show the internal structure of a mammalian heart

1. Using arrows show the direction of blood flow in and out of the heart 
2. Name the parts labeled A and C
3. The muscular wall of chamber D is at least three times thicker than the wall of chamber E. give a reason for this difference
4. In what way does the artery labeled G differ from other arteries in the body

Answer 1

1. 
   
2. A - Aorta 
   C - Semilunar valves 
3. Because D (left ventricle) has to pump blood all over the body whereas E (right ventricle) only pumps blood to the lungs. (Thicker walls helps D to exert pressure to force blood all over the body)
4. (pulmonary artery) carries deoxygenated blood from the right ventricle to the lungs