NERVOUS SYSTEM
The nervous system includes all the organs and tissues which enable animals to respond to changes in their environment. A change in the environment is called a response. The nervous system of mammals is composed of two parts: the central…
RESPIRATORY SYSTEM
Respiratory system includes all the organs and tissues associated with the exchange of gases between an animal and its environment, leading to the release of energy. The purpose of respiration is to supply oxygen to the cells which oxidise or…
Study Guide
