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Warm-up

Warm-up. Have these worksheets out on your desk: “Hormonal control of blood glucose” “Human Growth” Answer in your warm-up: What are general functions of endocrine system networks? Maintain homeostasis and respond to stimuli (and regulate development). What we will learn today….

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Warm-up

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  1. Warm-up Have these worksheets out on your desk: • “Hormonal control of blood glucose” • “Human Growth” Answer in your warm-up: What are general functions of endocrine system networks? • Maintain homeostasis and respond to stimuli (and regulate development)

  2. What we will learn today… What characteristics of endocrine networks allow them to maintain homeostasis?

  3. Neuronal network (neurons in series) Neuron #1 Neuron #2 Neuron #3 glutamate GABA (dopamine) insulin glucose Network that does NOT result in homeostasis: + - Networks that DO result in homeostasis: Endocrine network (blood glucose) Endocrine network (growth hormone) + - Pituitary Hypothalamus GHRH GH - +

  4. insulin glucose Negative Feedback Diagram: Definition/Description: • _________________ • _________________ Effect/outcome: • Produces HOMEOSTASIS + - Pituitary Hypothalamus GHRH GH - +

  5. Check your understanding! • Are these examples of negative feedback? • Do these networks produce homeostasis? + + B - B A A B A - + + - C - - D C C +

  6. Is this an example of negative feedback?Will this network produce homeostasis? • Describe the effect of this network. • Describe the characteristics of this network that cause its effects. + B A +

  7. Positive Feedback CHILDBIRTH: (leave space for another diagram) Diagram: Definition/Description: • _________________ • _________________ Effect/outcome: • _________________ (NOT homeostasis) Pituitary gland OXYTOCIN + B A + (nervous system) + + Uterus muscles contract pressure sensors +

  8. Homework: • Read pages 1038-1040 in your text.

  9. Homework: Give a specific example of a negative feedback loop and a specific example of a positive feedback loop (biological or non-biological). For both examples: • Describe the feedback loop. • Diagram the network with nodes and edges. • Explain what features of the network define it as a positive or negative feedback loop.

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