Can you help me out with this circulatory system problem

explain all the consequences for the circulation process if:
A) both sides of the heart would have the same size.
B) the pulmonary vein is broken.
C) the heart septum would have a gap
D) the capillaries wall would not be permeable.

B) sufficient amount of purified blood would not drain into the left auricle and hence systolic pressure decrease and blood pumping would be affected
c) mixing of oxygenated and deoxygenated blood would leads
d)if it would be then no biological process will occurs because it absorbs the digested food