Actually, there is no difference at all, other than the size differences. This is the same with dogs. :)
The carotid arteries are very similar in pigs and humans. The cardiovascular system is conserved across all mammal species including pigs and humans.
Cardiology
The major difference between the vascular system of a human and a starfish is that humans have cardio vascular system and starfish have water vascular system.
One is larger
stars are far and the sun is close
by the cardiovascular system (in blood)
There is the endocrine system cardiovascular system skeletalmuscular system respiratory system gastrointestinal system genitourinal system neurovascular system and the skin.
sharks have large crap we have crap 75% smaller
The hippo has a three chambered stomach which slowers the speed of the passage of the food
There is very little difference between the circulatory system of a horse and a human other than size. The other primary difference would be that the human system functions on a vertical plane and the horse system functions on a more horizontal plane because of the natural orientation of their bodies.
humans talk, phones answer.
Cats do not have appendix and humans do.