Receptors and Sense Organs in Animals | Zoology
Here is a List of receptors and sense organs found in animals. Invertebrate Receptors: 1. Mechanoreceptors: Four types of mechanoreceptors are present in invertebrates: i. Tactile receptors: The tactile (touch) receptor is a phasic receptor. In cnidaria the tactile receptors cnidocils are present (Fig. 14.1) in the cnidocytes (cnidoblasts). The cnidocil being touched, the cnidocyte contracts violently discharging the nematocyst. [...]