Levels of Structural Organization in Human Body
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Questions and Answers

Which level of structural organization consists of molecules combining to form the smallest living units in the human body?

  • Organ level
  • Tissue level
  • Chemical level
  • Cellular level (correct)

    • Which level of structural organization involves groups of cells and materials working together to perform a function?

  • System level
  • Tissue level (correct)
  • Chemical level
  • Cellular level

    • Which level of structural organization includes structures of 2 or more different types of tissues?

  • Organism level
  • Tissue level
  • Organ level (correct)
  • System level

    • Which of the following is NOT a component of the extracellular fluid?

    <p>$H_2O$ (water)</p> Signup and view all the answers

    What percentage of body water is intracellular?

    <p>80%</p> Signup and view all the answers

    Which ions are found in the intracellular fluid?

    <p>$K^+$ (potassium)</p> Signup and view all the answers

    Which of the following is NOT a function of the endocrine system in regulating homeostasis?

    <p>Maintaining nearly constant conditions in the internal environment</p> Signup and view all the answers

    What is the role of a receptor in a feedback system?

    <p>Monitoring changes in a controlled condition and sending input to a control center</p> Signup and view all the answers

    What do special mechanisms for transporting ions through the cell membrane maintain?

    <p>The ion concentration differences between intracellular and extracellular fluids</p> Signup and view all the answers

    How does the nervous system regulate homeostasis?

    <p>By sending electrical signals to organs to counteract changes from the balanced state</p> Signup and view all the answers

    What happens when the body is unable to restore physiological variables to normal?

    <p>Disease or death can result</p> Signup and view all the answers

    What does a control center in the body do in a feedback system?

    <p>Sets the range of values within which a controlled condition should be maintained and evaluates input received from receptors</p> Signup and view all the answers

    What is the nature of most control systems when some factor becomes excessive or deficient?

    <p>Initiating negative feedback</p> Signup and view all the answers

    What is an effector in a feedback system responsible for?

    <p>Receiving output from the control center and producing a response or effect that changes the controlled condition</p> Signup and view all the answers

    What might cause homeostatic imbalances according to the text?

    <p>Disruptions from both internal and external environments</p> Signup and view all the answers

    What are found in large amounts in intracellular fluid according to the text?

    <p>Potassium, magnesium, and phosphate ions</p> Signup and view all the answers

    What is the main function of the extracellular fluid?

    <p>Providing an environment for all cells to live in</p> Signup and view all the answers

    In the body, which system is responsible for transporting carbon dioxide from the cells to the lungs for excretion?

    <p>Respiratory system</p> Signup and view all the answers

    Which of the following is a component of the intracellular fluid?

    <p>Amino acids</p> Signup and view all the answers

    What is the primary function of the endocrine system in maintaining homeostasis?

    <p>Producing and secreting hormones</p> Signup and view all the answers

    Which level of structural organization involves structures comprising 2 or more different types of tissues?

    <p>Organ level</p> Signup and view all the answers

    What percentage of body water constitutes the extracellular fluid?

    <p>40%</p> Signup and view all the answers

    What factor do special mechanisms for transporting ions through the cell membrane maintain?

    <p>Ion concentration differences between extracellular and intracellular fluids</p> Signup and view all the answers

    What is the role of the endocrine system in regulating homeostasis?

    <p>Secreting hormones into the blood</p> Signup and view all the answers

    Which level of structural organization consists of molecules combining to form the smallest living units in the human body?

    <p>Chemical level</p> Signup and view all the answers

    Which ions are found in large amounts in intracellular fluid according to the text?

    <p>Potassium, magnesium, and phosphate ions</p> Signup and view all the answers

    Which level of structural organization involves groups of cells and materials working together to perform a function?

    <p>Tissue level</p> Signup and view all the answers

    Which of the following is NOT a component of the extracellular fluid?

    <p>Potassium ions</p> Signup and view all the answers

    How does the nervous system regulate homeostasis?

    <p>Sending electrical signals to organs</p> Signup and view all the answers

    What happens when the body is unable to restore physiological variables to normal?

    <p>Disease or death can result</p> Signup and view all the answers

    What does a control center in the body do in a feedback system?

    <p>Sets the range of values within which a controlled condition should be maintained, evaluates input it receives from receptors, and generates output commands when needed</p> Signup and view all the answers

    What might cause homeostatic imbalances according to the text?

    <p>Intense and prolonged disruptions from both external and internal environment</p> Signup and view all the answers

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