[Solved] Orgasmic dysfunction is one form of A)erotic plasticity. B)STI. C)refractory period. D)sexual disorder. Nephridia: Excretory organs in many invertebrates, such as annelids, that remove metabolic wastes from an organism's body. Branching Tubes: Refers to the structures found in organisms, such as the respiratory and vascular systems, that divide and subdivide into smaller tubes. Capillary Network: An intricate network of capillaries, the smallest blood vessels, facilitating the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste substances between blood and tissues. Metanephridia: Excretory organs found in some invertebrates, such as annelid worms, that help in the removal of metabolic wastes.