define terms of atom,nervous system

Certainly, here are definitions for the terms "atom" and "nervous system": 1. **Atom:** - **Definition:** An atom is the smallest unit of a chemical element, consisting of a nucleus of protons and neutrons, with electrons in orbit around the nucleus. Atoms are the basic building blocks of matter and participate in chemical reactions to form molecules. 2. **Nervous System:** - **Definition:** The nervous system is a complex network of nerves and cells that transmit signals between different parts of the body. It includes the central nervous system (brain and spinal cord) and the peripheral nervous system (nerves outside the brain and spinal cord). The nervous system plays a crucial role in receiving and interpreting sensory input, coordinating body movements, and regulating physiological functions. These definitions provide a brief overview of these terms, and each term encompasses a more detailed and intricate set of concepts within the fields of chemistry and biology, respectively.