The nervous system is like a big network of wires in our bodies. It helps control what our bodies do and how we react to things happening around us. Here are the main parts:

1. Central Nervous System (CNS):

   • Brain: Think of it as the boss. It helps us understand what we see, hear, and feel. For example, if you spot a bright light, your brain tells you whether to squint your eyes or turn away.
   • Spinal Cord: This is the link between the brain and the rest of your body. It helps with quick reactions. If you touch something hot, your spinal cord can make you pull your hand back before your brain even knows what happened.

2. Peripheral Nervous System (PNS):

   • Somatic Nervous System: This part helps with movements we choose to make. When you decide to wave your hand to say hello, this system helps your arm muscles get to work.
   • Autonomic Nervous System: This part runs automatically without us thinking about it. It takes care of things like our heartbeat and digestion. It has two parts: one for when we need to react quickly (the sympathetic system) and one for when we are resting (the parasympathetic system).

3. Neurons and Glial Cells:

   • Neurons: These are the messengers of the nervous system. They send signals to each other through tiny gaps called synapses, using chemicals called neurotransmitters.
   • Glial Cells: These are like the helpers for neurons. They give support by keeping neurons healthy and providing them what they need.

In short, the nervous system—from the brain all the way to the smallest neurons—works together to help our bodies respond quickly to changes. It keeps everything balanced inside us and allows us to interact with the world around us.