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) (D)</p> Signup and view all the answers

What percentage of body water is intracellular?

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

Which ions are found in the intracellular fluid?

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

What might cause homeostatic imbalances according to the text?

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

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

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

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

<p>Producing and secreting hormones (C)</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 (D)</p> Signup and view all the answers

What percentage of body water constitutes the extracellular fluid?

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

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

<p>Secreting hormones into the blood (A)</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 (D)</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 (B)</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 (D)</p> Signup and view all the answers

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

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

How does the nervous system regulate homeostasis?

<p>Sending electrical signals to organs (B)</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 (B)</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 (D)</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 (C)</p> Signup and view all the answers

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