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Biology Chapter 3

Biology Chapter 3. 3B-1. Review Questions. Why is homeostasis called an equilibrium? Why is homeostasis called dynamic? It is an equilibrium because It involves a balance between the cell an its environment

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Biology Chapter 3

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  1. BiologyChapter 3 3B-1

  2. Review Questions • Why is homeostasis called an equilibrium? Why is homeostasis called dynamic? • It is an equilibrium because It involves a balance between the cell an its environment • It is dynamic because once homeostasis is achieved, there is still movement of water and solutes across the membrane

  3. Review Questions • 2. Compare and contrast optimal point, optimal range, range of tolerance, and limit of tolerance • Optimal point- the point where organisms function best • Optimal range- the limit within organism function properly • Range of tolerance- an organism is stil alive, but begin to deteriorate • Limit of Tolerance- Organisms can no longer function properly-leading to death

  4. Review Questions • 3. Explain the difference between plasmolysis and cytolysis • Plasmolysis is the shrinking of cells due to water loss • Cytolysis is the bursting of a cell due to increased water pressure

  5. Review Questions • 4. Compare and contrast isotonic, hypotonic, and hypertonic solutions • They are each a comparison of two solutions • If the concentration is equal the solutions are equal they are isotonic • If they are not equal, the solution with the greater concentration is hypertonic and the solution with the lesser concentration is hypotonic

  6. Review Questions • 5. List two methods some cells use to withstand hypotonic environments, discussing important structures and how they function • Plant cells may use a central vacuole that stores excess water- as it becomes full, it expands, pushing the cytoplasmic contents against the cell wall. This expansion increases pressure, it reaches a point where the pressure pushing water into the cell cannot overcome the pressure inside the cell

  7. Question 5 Continued • Some single celled organisms have a contractile vacuole used as a holding tank-once it becomes full it merges with the cell membrane and empties the water outside of the cell

  8. Things to Know • The bursting of blood cells in hypotonic solution is called__________ (89) • The solution in which the dissolved substances are the same concentration as they are in the cell’s cytoplasm is a _______ solution. (89) • A __________solution is exists when the substance dissolved outside the cells are more abundant than those outside the cytoplasm (89) • A solution that has a greater concetration of water molecules than its cell it surrounds is a ________solution (89)

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