Allergy Tests. Guide. Allergy testing involves having a skin or blood test to find out what substance, or allergen, may trigger an allergic response in a person.Skin tests are usually done because they are rapid, reliable, and generally less expensive than blood tests, but either type of test may be used.llergy blood tests look for substances in the blood called antibodies. Blood tests are not as sensitive as skin tests but are often used for people who are not able to have skin tests. The most common type of blood test used is the enzyme-linked immunosorbent assay (ELISA, EIA).
Sensory Structures of a Flatworm. Flatworms live in many environments. Jupiterimages/Photos.com/Getty Images. Flatworms, also called planarians, belong to the phylum Platyhelminthes. Characterized by flat bodies, they have no circulatory or respiratory organs and a very simple digestive tract.This body plan limits them to very small, flat shapes to allow them to absorb oxygen and moisture.owever, a flatwormâs body contains the beginnings of more complex structures found in other animals. For example, eye spots resemble the ancestral forms found in more complex animals. Understanding flatworm sensory structures can help you understand the origins of these organs.
1 In slides 21 and 35 of the skin, sensory nerve endings are inside Pacinian and Meissner's corpuscles. 2  Pacinian or lamellar corpuscles, which are encapsulated receptors for deep pressure, are found in the dense connective tissue of the dermis below the epithelium in slide 21.ther members of this group of receptors include free nerve endings in the connective tissue, as well as the muscle spindle and Golgi tendon organ found in the musculoskeletal system. Special sensory receptors have specific anatomic locations.