bio 1

Cards (15)

  • Human Biology
    Overview of Organization
  • Homeostasis
    A balance between life and death
  • Homeostasis
    • Ability to maintain stable internal conditions despite a changing external environment
    • How body maintains typical temperature on a hot day
    • What happens when blood glucose levels rise
    • What happens if body fails to maintain homeostasis
  • Homeostatic Control
    1. Receptors
    2. Control centers
    3. Effectors
  • It gets cold outside
    Lowers the heat inside
  • Something picks up the drop in heat
    Sends a signal to heat the house
  • Positive feedback
    Accelerates or enhances the output created by a stimulus
  • Negative feedback
    Reduces or suppresses the original stimulus, reverses a change in the controlled variable, bringing it back to normal, maintains homeostasis
  • Positive feedback
    • Child birth, blood clotting
  • Negative feedback
    • Blood sugar levels, body temperature
  • An apple in a tree randomly ripens. As it ripens, this causes it to release ethylene glycol, a ripening agent. This causes the nearby apples to ripen, which also produce ethylene glycol. Within 24 hours, the entire tree is filled with ripened apples.
  • This is an example of positive feedback
  • Levels of biological organization from smallest to largest
    • Chemical
    • Macromolecules
    • Organelles
    • Cells
    • Tissues
    • Organs
    • Organ Systems
    • Organism
  • Skin would best be described as a tissue
  • Properties of life
    • Metabolism
    • Responsiveness
    • Movement
    • Growth
    • Differentiation
    • Reproduction