1. The nervous system is responsible for coordinating everything you do, helping you respond and adapt to stimuli, and maintaining your body's internal environment by controlling things like breathing and body temperature.
2. Neurons are specialized cells that form the basic units of structure and organization in the nervous system. They are made up of a cell body, dendrites, and an axon. The cell body contains the nucleus, which is the control center of the neuron. Dendrites receive incoming signals, while the axon transmits outgoing signals.
3. A synapse is a junction between two neurons where communication occurs. When an electrical signal reaches the end of an axon, it triggers the release of chemical messengers called neurotransmitters into the synaptic cleft. These neurotransmitters bind to receptors on the next neuron, converting the signal back into an electrical impulse.
4. The central nervous system (CNS) consists of the brain and spinal cord. It processes information from sensory neurons and sends out commands through motor neurons. The peripheral nervous system (PNS) connects the CNS to the rest of the body, transmitting sensory information to the CNS and carrying motor commands from the CNS to muscles and glands.
5. Reflexes are rapid, automatic responses to stimuli that occur without conscious thought. They involve a simple neural pathway called a reflex arc, which typically includes a sensory neuron, an interneuron in the spinal cord, and a motor neuron. This allows for quick reactions, such as pulling your hand away from a hot surface, to protect the body from harm.
Parent Tip: Review the logic above to help your child master the concept of nerves worksheet.
