PSYC 2040 Chapter : Chapter 5
Document Summary
The main distinguishing features of the kingdom animalia are. In addition to these characteristics, as animals evolved from the animal-like protists, they developed more complex and organized bodies. Some of these increases in complexity and organization are: Cephalization is the concentration of nervous tissue (including a brain and sensory organs) into a defined region (head) of the body. Segmentation is a body design in which similar repeating units are present. These and other characteristics are used to define the groups within the kingdom. Cellular specialization leads to the development of tissues, which then can lead to the combination of tissues into an organ. Organs may then become arranged into organ systems. Tissues are specialized cells with a common structure and function that are grouped together. Organ systems are groups of two or more organs that function together to perform a common task (e. g. , digestion, gas exchange, reproduction) Organs are centers of bodily function, which are usually made up of different.
