Title: Animals Two - Animals with Body Cavities: Pseudocoelomates and Protostome Coelomates - BIOL110F2013 - Confluence
Headings: 
Introduction and Learning Objectives
Coelomates and Pseudocoelomates
Pseudocoelomates: The Phylum Nematoda
Nematodes as Model Organisms
Coelomates: Protostomes versus Deuterostomes
Protostome Coelomates: The Phylum Mollusca
Mollusk Anatomy
Protostome Coelomates: The Phylum Annelida
Arthropod Diversity
Characteristics of Arthropods
Phylum Arthropoda: Classification
Summary
Terms

Content: 6) was passed from the intestine of a human. The ruler at the side is approximately 1.5 inches long. Figure 6. Ascaris lumbricoides. Roundworms that can infect the human intestines. ( Click image to enlarge)
Other nematodes include pinworms, hookworms, and Trichinella spiralis (the causative agent of trichinosis). This hookworm mouth (Fig. 7) reveals how these worms are able to latch on to a host and penetrate the host's intestines and other organs. Symptoms of helminth infections include diarrhea, anemia, pneumonia, as well as physical and mental retardation. The World Health Organization (WHO) data suggest that 1/3 of the world’s population is at risk of infection, with one in six people already infected.