6.5 Nerves, hormones and homeostasis

IB Assessment Statements

  • 6.5.1 State that the nervous system consists of the central nervous system (CNS) and peripheral nerves, and is composed of cells called neurons that can carry rapid electrical impulses.
  • 6.5.2 Draw and label a diagram of the structure of a motor neuron.
  • 6.5.3 State that nerve impulses are conducted from receptors to the CNS by sensory neurons, within the CNS by relay neurons, and from the CNS to effectors by motor neurons.
  • 6.5.4 Define resting potential and action potential (depolarization and repolarization)
  • 6.5.5 Explain how a nerve impulse passes a non-myelinated neuron.
  • 6.5.6 Explain the principles of synaptic transmission.
  • 6.5.7 State that the endocrine system consists of glands that release hormones that are transported in the blood.
  • 6.5.8 State that homeostasis involves maintaining the internal environment between limits, including blood, pH, carbon dioxide, blood glucose concentration, body temperature and water balance.
  • 6.5.9 Explain that homeostasis involves monitoring levels of variables and correcting changes in levels by negative feedback mechanisms.
  • 6.5.10 Explain the control of body temperature, including the transfer of heat in blood, and the roles of the hypothalamus, sweat glands, skin arterioles and shivering.
  • 6.5.11 Explain the control of blood glucose concentration, including the roles of glucagon, insulin and α and β cells in the pancreatic islets.
  • 6.5.12 Distinguish between type I and type II diabetes.

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PPTs: 1 / 2

Articles:

Websites:

Videos and Simulations:

  • Harvard Outreach Program Simulations: Action Potential, Anatomy of the Brain, Synaptic Transmission, Brain Synapse
  • Blood Sugar Homeostasis: Animation
  • The Nervous System Crash Course

  • Negative Feedback and Homeostasis:
  • Termoregulation in animals:
  • How do pain relievers work:

 

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