Unit 2 Review

2. The gap between two neurons where messages are transmitted.
4. The long, thin part of a neuron that sends messages to other neurons.
6. System The network of cells that sends messages between the brain and the body.
12. Nervous System The part of the autonomic nervous system that calms the body and conserves energy (rest and digest).
14. A fatty substance that surrounds and insulates axons, helping messages travel faster.
15. Nervous System The part of the nervous system outside the CNS that connects the brain and spinal cord to the rest of the body.
16. Nervous System The part of the nervous system that includes the brain and spinal cord.

1. An automatic response to a stimulus that does not involve the brain.
3. Nervous System A part of the PNS that controls involuntary actions like heartbeats and digestion.
5. Bundles of fibers that transmit signals to and from the CNS.
6. The cells in the nervous system that send and receive messages.
7. Nervous System A part of the PNS that controls voluntary movements of skeletal muscles.
8. Cells Support cells in the nervous system that help protect and nourish neurons.
9. Branch-like structures that receive messages from other neurons.
10. Arc The pathway that a reflex signal travels, from sensory neuron to spinal cord and back to a muscle.
11. Nervous System The part of the autonomic nervous system that prepares the body for stress or emergency (fight or flight).
13. Body The part of the neuron that contains the nucleus and keeps the cell alive.