Single loop circulation is the type of circulatory system that occur in fishes. Single loop circulation is simple. There is passage of blood only once through the heart in each complete cycle of the body. The blood flows from the heart through the gills, through the body and back to the heart. In single loop circulation, blood pressure is limited because of the frail nature of the tiny capillaries in the gills.
Using the concept that : <span>The skin cell has twice the number of chromosomes as the sperm cell has. </span>Hence, <span>The sperm cell has 39 chromosomes. The skin Cell will have = 39 x 2 = 78 </span><span>chromosomes.</span>
