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Molecules in Our Bodies

Molecules in Our Bodies. pH. pH = Power of Hydrogen Logarithmic Scale: 0-14 Shows concentration of H+ ions in water Water dissociates into H + and OH - 10^-7 H + in normal water: pH 7 = neutral Acids (0-6) and Bases (8-14) Controls enzymes and reactions. Feedback.

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Molecules in Our Bodies

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  1. Molecules in Our Bodies

  2. pH pH = Power of Hydrogen Logarithmic Scale: 0-14 Shows concentration of H+ ions in water Water dissociates into H+ and OH- 10^-7 H+ in normal water: pH 7 = neutral Acids (0-6) and Bases (8-14) Controls enzymes and reactions

  3. Feedback Homeostasis: We must maintain a stable internal environment (balance). Positive vs. Negative Feedback Example: Temperature Is temperature a positive or negative feedback loop? Molecules help us maintain balance!

  4. Digestion • How do we get energy and nutrition from our food? 40.3 (p. 828) and 41.2 (p. 849) • Why do we pee? • 44.2 (p.927) • (also 44.4 - kidneys)

  5. Respiration • How do we get oxygen to our cells and get rid of the carbon dioxide waste? 42.7 (p.891)

  6. Health/Immunity • What is the role of chemical receptors in our immune system’s ability to fight off disease? 43.2 (p.903) • How does the misrecognition of molecules create allergies and autoimmune diseases? 43.5 (p.916)

  7. Reproduction • Why do women get periods? 46.4 (p.973) • How do hormones control the development of a zygote into an embryo? 47.1 (p. 989)

  8. Growing Up • How do hormones communicate with your cells to regulate growth and reproduction? 45.2 (p. 945)

  9. Processing Information • How do brain cells send signals? 48.3 and 48.4 (p.1017)

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