The frog acts rather like the heart, blood flows down the horses leg, into the frog, and the horses weight compresses the frog on the ground, and essentially squeezes the blood out of the frog, pushing it back up the horse's legs.
The frog acts rather like the heart, blood flows down the horses leg, into the frog. The horses weight compresses the frog on the ground. The horses weight are pushing it back up the horse's legs. The horses weight essentially squeezes the blood out of the frog. The horses weight essentially are pushing it back up the horse's legs.