2.2 - pt. 1 nervous control

• nervous control


  allows cells in different parts of the body to communicate with each other, made of the cns + pns
• central nervous system (cns)


  made of brain + spinal cord
• sensory neurons


  comes from receptors and sends a signal to inter neurons @PNS
• inter neurons


  processes the information from senses requiring a response and relays signal to motor neurons @CNS
• motor neurons


  enables a response to occur at an effector @CNS
• effector


  organ or cell that acts in response to a stimulus
• stimulus


  something which evokes a specific function reaction in an organ or tissue
• muscle


  fast effector
• gland


  slow effector
• receptor


  organ or cell which is able to respond to light, heat, or any other external stimulus and transmits a signal to the sensory neuron
• cerebrum


  conscious thoughts, reasoning, memory, emotions, learning languages @large folded area of the brain
• cerebellum


  balance, muscle coordination @below cerebrum at the rear of the brain
• medulla


  maining heart + breathing rate @top of spinal cord
• reflex arc


  the nerve pathway that reflex action follows
• reflex action


  process of human reaction through the cns
• synapses


  narrow gaps separating neurons
• processes of synapses

  when an electrical signal reaches the end of a neuron, chemicals are released, diffusing across the synapse and triggering the end where the next reaction occurs
• use of human reaction

  protection
• stages of reflex action


  stimulus detected by receptor sending signal through sensory neuron to inter neuron in the cns, which relays the signal to the motor neuron, transmitting it to an effector triggering the response