Molecules in Our Bodies. pH pH = Power of Hydrogen Logarithmic Scale: 0-14 Shows concentration of H+...
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Transcript of Molecules in Our Bodies. pH pH = Power of Hydrogen Logarithmic Scale: 0-14 Shows concentration of H+...
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
FeedbackHomeostasis: We must maintain a stable internal environment (balance).
Positive vs. Negative Feedback
Example: TemperatureIs temperature a positive or
negativefeedback loop?
Molecules help us maintain balance!
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)
Respiration
• How do we get oxygen to our cells and get rid of the carbon dioxide waste? 42.7 (p.891)
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)
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)
Growing Up
• How do hormones communicate with your cells to regulate growth and reproduction?45.2 (p. 945)
Processing Information
• How do brain cells send signals?48.3 and 48.4 (p.1017)