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.
The thalamus, which is in charge of sensory perception and the  regulation of motor functions, receives signals from almost all  senses. The only exception to this is the se â¦ nse of smell.ll of our senses except for our sense of smell. They are controlled by a separate station, the olfactory bulb, which explains why certains smells seem to do such a good job at bringing back certain memories.