ch 31 review homeostasis

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Siobhan
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ch 31 review homeostasis
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2012-02-07 14:23:18
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ch 31 review
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  1. What does homeostasis mean?
    • The maintenance of the same exact conditions in every cell in a body.
    • The maintenance of identical conditions in a cell at all stages in the cell cycle.
    • The maintenance of stable conditions in the body for optimal cell functioning.
    • The maintenance of identical conditions on the inside and outside of a cell.

  2. Why would a constant supply of glucose and oxygen be important to a cell?
    • To fuel the process of anaerobic respiration, which provides the cell with the maximum amount of energy per glucose.
    • To enter metabolic reactions that generate the ATP required to fuel cell activities.
    • Metabolism in cells is directly fueled by glucose when oxygen is present.
    • ATP is a waste product that must be removed by the cells through the metabolism of glucose and oxygen.

  3. __________ are endotherms and __________ are ectotherms.
    • Fish; humans
    • Fish; lizards
    • Humans; fish
    • Humans; monkeys

  4. How might a fever of 105ºF affect metabolic reactions in a persons body?
    • It will speed up metabolic reactions, making the use of glucose more efficient.
    • It will slow down metabolic reactions, making the use of glucose less efficient.
    • Heat denatures the catalysts three dimensional structure, which will shut down metabolic reactions.
    • Heat denatures the catalysts three dimensional structure, speeding up metabolic reactions.

  5. How would falling though ice affect metabolic reactions in a persons body?
    • There would be no change as the cells would generate their own heat through metabolic
    • reactions.
    • Very cold temperatures would immediately cause the enzymes to denature and all metabolic reactions to halt.
    • Very cold temperatures would significantly speed up the reactions, especially the need for oxygen and ATP.
    • Very cold temperatures would significantly slow down the reactions, especially the need for oxygen and ATP.

  6. Why does Cranwell's horned frog estivate (hibernate) in extremely cold temperatures?
    • To find and absorb energy from the ground because it is an ectotherm and the air is too cold
    • To find and absorb energy from the ground because it is an endotherm and the air is too cold
    • To save energy because it is an ectotherm and its metabolism cannot function in the cold
    • To save energy because it is an endotherm and its metabolism cannot function in the cold

  7. From smallest to largest, which is the correct order of levels of organization of living things?
    • Subatomic particles, molecules, organelles, atoms, cells, tissues, organs, organ systems
    • Organ systems, organs, tissues, cells, organelles, molecules, atoms, subatomic particles
    • Subatomic particles, atoms, molecules, organelles, cells, tissues, organs, organ systems
    • Molecules, atoms, subatomic particles, organelles, cells, tissues, organs, organ systems

  8. Where would a single layer of ciliated, mucous-secreting epithelial cells be found?
    • Stomach
    • Mouth
    • Skin
    • Trachea

  9. You constantly lose epithelial skin cells, and yet your skin remains intact. This is because:
    • The connective tissue cells replace the lost epithelial cells.
    • You are born with enough epithelial cells to withstand the continuous loss.
    • The epithelial skin cells are constantly replaced through meiosis.
    • The epithelial skin cells are constantly replaced through mitosis.

  10. Bone cells form in circles around a central canal. What is in this central canal?
    • Cartilage
    • Connective tissue
    • A blood vessel
    • Adipose

  11. A structure that is made of more than one kind of tissue is:
    • Mutated.
    • Damaged.
    • An organ.
    • Undergoing mitosis.

  12. What is the largest organ in the body?
    • Heart
    • Large intestine
    • Liver
    • Skin

  13. Why do you get goose bumps when you are cold and shiver?
    • The skin fills with blood to warm the outer surface, making a bumpy appearance.
    • The skin fills with tiny warming air pockets causing the bumpy appearance.
    • Adipose collects in pockets under the skin to warm the outer surface, making the hairs stand up on end, causing the bumpy appearance.
    • Muscles surrounding skin hairs contract. This generates heat, making the hairs stand up on end, causing the bumpy appearance.



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