Chapter 13 The Nervous System Lesson 1 - Introduction to the Nervous System
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The document discusses the nervous system in mammals. It describes how the nervous system is divided into the central nervous system and peripheral nervous system. The central nervous system consists of the brain and spinal cord, while the peripheral nervous system consists of nerves connecting to sense organs and effectors throughout the rest of the body. Stimuli detected by receptors are transmitted via nerve impulses to the central nervous system, which then sends nerve impulses to effectors to elicit a response.
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Chapter 13 The Nervous System Lesson 1 - Introduction to the Nervous System
- 1. Coordination and response The Nervous System in Mammals Chapter 13
- 2. Sensitivity The ability of an organism to respond to a stimulus is called sensitivity / irritability response usually beneficial to the organism varies between invertebrates and vertebrates
- 3. Invertebrates Do not have well developed brain Has a nervous system to control activities and reactions to surroundings Vertebrates Has a well developed brain Has a nervous system Highly specialized sense organs
- 4. Voluntary vs Involuntary actions Involuntary actions - Actions not under the control of the will - e.g. heartbeat, peristalsis, breathing movements Voluntary actions - Actions under the control of the will
- 5. Nervous system The Nervous System is divided into: Central Nervous System Peripheral Nervous System
- 7. Central Nervous System (CNS) Consists of Brain Spinal cord
- 8. Peripheral Nervous System Consists of cranial nerves from brain spinal nerves from spinal cord sense organs (sense stimuli receptors)
- 9. In summary… Central Nervous System = Brain + Spinal Cord Peripheral Nervous System =nerves to rest of body
- 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