Nervous System Test

• What are sensory receptors?

  a nerve ending that sends signals to the central nervous system when it is stimulated
• Chemoreceptors

  respond to chemicals in and smell and in internal changes
• Thermoreceptors


  respond to temperature changes
• Mechanoreceptors


  respond to physical forces in touch, hearing, and pressure
• Photoreceptors


  respond to light
• Nociceptors


  respond to tissue damage (pain)
• Proprioceptors


  respond to the body's positions of skeletal muscles, tendons, ligaments, and joints
• Dopamine


  “pleasure chemical” is released when mammals receive a reward in response to their behavior.
• Serotonin


  “calming” chemical, mood modifier, linked to depression and appetite management, sleep, memory, and, most recently, decision-making behaviors.
• Epinephrine


  very similar to norepinephrine, epinephrine has slightly more of an effect on your heart.
• Norepinephrin


  
  

  a hormone (which you might know as

  adrenaline). It has been linked to mood, memory, and stress.

  Norepinephrine has more of an effect on your blood vessels
• The eye: Sclera


  Helps to maintain of the eyeball and provides an attachment point for the extrinsic eye muscles
• The eye: Cornea

  Forms a clear window that is the major light-bending (refracting) medium of the eye
• The eye: Choroid


  The blood vessels nourish the other layers of the eye, and the melanin helps to absorb excess light
• The eye: Cilary body

  Contains the ciliary muscle and ciliary process
• The eye: Iris

  Controls the amount of light entering the eye by changing the size of the pupil diameter
• The eye: Retina

  Captures the light that enters your eye and helps translate it into the images you see
• The eye: Lens

  Transmit light, focusing it on the retina