Coordination and response The Nervous System in Mammals Chapter 13
Sensitivity <ul><li>The ability of an organism to respond to a stimulus is called  sensitivity  /  irritability </li></ul>...
Invertebrates <ul><li>Do not have well developed brain </li></ul><ul><li>Has a nervous system to control activities and re...
Voluntary vs Involuntary actions <ul><li>Involuntary actions </li></ul><ul><li>-  Actions not under the control of the wil...
Nervous system <ul><li>The Nervous System is divided into:  </li></ul><ul><li>Central Nervous System  </li></ul><ul><li>Pe...
Nervous System
Central Nervous System (CNS) <ul><li>Consists of </li></ul><ul><li>Brain  </li></ul><ul><li>Spinal cord </li></ul>
Peripheral Nervous System <ul><li>Consists of  </li></ul><ul><li>cranial nerves from brain </li></ul><ul><li>spinal nerves...
In summary… Central Nervous System = Brain + Spinal Cord  Peripheral Nervous System   =nerves to rest of body
What happens when… stimuli receptors nerve impulses CNS    B rain effectors nerve impulses Tap on shoulder turn head/shru...
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Chapter 13 The Nervous System Lesson 1 - Introduction to the Nervous System

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Chapter 13 The Nervous System Lesson 1 - Introduction to the Nervous System

  1. 1. Coordination and response The Nervous System in Mammals Chapter 13
  2. 2. Sensitivity <ul><li>The ability of an organism to respond to a stimulus is called sensitivity / irritability </li></ul><ul><li>response usually beneficial to the organism </li></ul><ul><li>varies between invertebrates and vertebrates </li></ul>
  3. 3. Invertebrates <ul><li>Do not have well developed brain </li></ul><ul><li>Has a nervous system to control activities and reactions to surroundings </li></ul>Vertebrates <ul><li>Has a well developed brain </li></ul><ul><li>Has a nervous system </li></ul><ul><li>Highly specialized sense organs </li></ul>
  4. 4. Voluntary vs Involuntary actions <ul><li>Involuntary actions </li></ul><ul><li>- Actions not under the control of the will </li></ul><ul><li>- e.g. heartbeat, peristalsis, breathing movements </li></ul><ul><li>Voluntary actions </li></ul><ul><li>- Actions under the control of the will </li></ul>
  5. 5. Nervous system <ul><li>The Nervous System is divided into: </li></ul><ul><li>Central Nervous System </li></ul><ul><li>Peripheral Nervous System </li></ul>
  6. 6. Nervous System
  7. 7. Central Nervous System (CNS) <ul><li>Consists of </li></ul><ul><li>Brain </li></ul><ul><li>Spinal cord </li></ul>
  8. 8. Peripheral Nervous System <ul><li>Consists of </li></ul><ul><li>cranial nerves from brain </li></ul><ul><li>spinal nerves from spinal cord </li></ul><ul><li>sense organs (sense stimuli  receptors) </li></ul>
  9. 9. In summary… Central Nervous System = Brain + Spinal Cord Peripheral Nervous System =nerves to rest of body
  10. 10. What happens when… stimuli receptors nerve impulses CNS  B rain effectors nerve impulses Tap on shoulder turn head/shrug shoulders Fraction of a second Feel the tap Fraction of a second Voluntary action

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