DNA has a negative charge because of the phosphate ions in its chemical backbone.
Homeostatic regulation involves three parts or mechanisms: 1) the receptor, 2) the control center and 3) the effector. The receptor receives information that something in the environment is changing. The control center or integration center receives and processes information from the receptor.
It is important that the internal environment of the body is controlled. Maintaining a constant internal environment is called homeostasis. The nervous system and hormones hormones: Chemical messengers produced in glands and carried by the blood to specific organs in the body are responsible for this. These are some of the internal conditions that are controlled.