Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Nervous System Function Allows your body to react to your environment and stimuli. Organs Brain Spinal cord Nerve cells (neurons) Brain Coordinates all of your body’s activities 3 parts: cerebrum, cerebellum, brain stem Cerebrum Cerebellum Brain Stem https:// www.yo utube.c om/wat ch?v=r SQNi5s Awuc Spinal cord 43 cm long and the diameter of your thumb Made of bundles of neurons to carry signals to and from the brain from the rest of the body. Neurons Parts: – Cell body – Dendrites (receive input) – Axons (deliver message) Direction of message How it works Nerve Messages Messages sent through a synapse (gap) https://www.youtube.com/ watch?v=p5zFgT4aofA https://www.youtu be.com/watch?v= WhowH0kb7n0 Messages move along neurons like batons in a relay race to spine, brain, and back 120 meters/second These signals can continue to work even if the brain is not sending the signal https://www.youtube.com/watch?v=2YZJt_ Bw3eo (twitching frog legs) https://www.youtube.com/watch?v=rSQNi5 sAwuc (TED talk- control someone else’s arm with your brain) Reflex Involuntary, automatic response to a stimulus (hot, cold, sharp) They can’t be controlled because they occur before you know what happened. Reflex responses are controlled by spinal cord, not brain = faster response Examples of reflexes Blinking, sneezing, knee tap, flinching, etc. diving, grasping, and moro (in babies) Diving Drug Effects Depressants (alcohol and marijuana) – slow your nervous system response time Stimulants (caffeine and methamphetamines) – speed up activity https://www.youtube.c om/watch?v=4spIzhl2c GE review https://www.youtube.com/watch?v=jJfESat tZOY