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Human Senses

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sensory nervous system

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Human Senses

  1. 1. Life Science Human Body Systems The Five Senses
  2. 2. Bonus: Outline the major divisions of the nervous system. In your lab notebook, please answer as best you can: Week 25 Review Quiz 1. What two major structures make up the CNS? • Brain and spinal cord 1. Are sensory neurons that carry info to the brain afferent or efferent nerves? • Afferent (afferent arrive, efferent exit) 1. True or False? The Autonomic Nervous System, regulated by the frontal lobe of the brain, operates in the background to control vital functions like breathing. • False (the brainstem, NOT the frontal lobe of the cerebrum, controls the ANS) 1. Do neurons use chemical or electrical mechanisms to transmit signals to and from the brain? • Both (neurotransmitters across the synapse to relay signals and electrical current along the length of the axon within each nerve) 1. What does the cerebellum do? • Coordinates muscle movements (posture, balance, & muscle memory)
  3. 3. The Sense of Smell
  4. 4. • Smell is closely tied to: – TASTE – MEMORY
  5. 5. Test Your Smell Savvy Identifying Different Scents
  6. 6. The Sense of Taste Gustatory hair Stratified squamous epithelium of tongue (c) Enlarged view of a taste bud
  7. 7. Experiment 16.4 Smell and Taste
  8. 8. Experiment 16.2 Pupils Respond to Light
  9. 9. The Sense of Sight Nerve fibers from each half of each retina split and cross over in the optic chiasm.
  10. 10. Experiment 16.5 Blind Spot More Vision Experiments Blind Spot Test
  11. 11. Bovine Eye Dissection Sense of Sight Step by step instructions
  12. 12. The Sense of Touch • Touch – Texture: (sticky, rough, soft) – Sensitive touch (hair movement) – Pressure • Pain • Heat • Cold • Proprioception – position relative to body
  13. 13. Reflex Arc • Sometimes quick action is needed – No time to "think" about moving – CNS is bypassed, so reaction time quickened – Realization of pain reaches brain after movement occurs Animation
  14. 14. Experiment 16.6 Touch Sensitivity