Nervous System and Endocrine system

3. system – The system that controls and coordinates body activities through electrical impulses.
10. – A structure that detects stimuli (e.g. eyes, skin, ears).
11. system – The system that controls body functions using chemical messengers called hormones.
12. – A muscle or gland that reacts to a nerve signal.
14. – Any change in the environment that causes a response (e.g. light, sound, heat).
18. – A nerve cell that transmits messages in the form of electrical signals.
19. – A gland that regulates blood sugar levels by releasing insulin and glucagon.
20. nervous system (CNS) – The part of the nervous system that includes the brain and spinal cord.

1. neuron – A neuron that carries information from sense organs to the CNS.
2. nervous system (PNS) – The network of nerves that connect the CNS to the rest of the body.
4. gland – The “master gland” that controls other endocrine glands; located at the base of the brain.
5. – The electrical message that travels through neurons.
6. – The body's ability to maintain a stable internal environment (like temperature or glucose levels).
7. neuron – A neuron that carries commands from the CNS to muscles or glands.
8. – The control center of the body, responsible for thinking, feeling, movement, and coordination.
9. – An organ that produces and releases substances like hormones (e.g. thyroid, pancreas).
13. – The small gap between two neurons where information is passed chemically.
15. – A chemical substance produced by a gland that travels in the blood and affects target organs.
16. cord – A bundle of nerves inside the spine that sends messages between the brain and the body.
17. – A fast, automatic response to a stimulus, controlled by the spinal cord.