roundworms parasites . ascariasis / male and female worm infographic graphic

anatomy and anus ascariasis ascarid background biology body care cell copulatory disease duct eelworm excretory female graphic heart hookworm human ill illustration infection infographic internal intestine male medical medicine nerve ovary parasite parasites pharynx pinworms ring roundworms section sick sperm spicule structure tapeworm testis uterus vulva whipworm white worm