Sharks have a complex circulatory system comprised of several structures. Which of the following lists the correct order blood flows through the structures of the shark circulatory system?
1) sinus venous, atrium, ventricle, ventral aorta, afferent arteries, gills, efferent arteries
2) sinus venous, atrium, ventricle, dorsal aorta, afferent arteries, gills, efferent arteries
3) sinus venous, ventricle, atrium, ventral aorta, efferent arteries, gills, afferent arteries
4) sinus venous, atrium, ventricle, ventral aorta, efferent arteries, gills, afferent arteries