Physiology: Compartmental Organization of Animals and Humans
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Questions and Answers

What percentage of a young adult's body is composed of water?

  • 50%
  • 75%
  • 90%
  • 65% (correct)
  • Where is the intracellular compartment located?

  • Within the cells (correct)
  • In the transcellular fluid
  • In the interstitial fluid
  • Inside the blood vessels
  • What is the main function of the extracellular fluid?

  • To synthesize new cells
  • To store excess nutrients
  • To provide a stable internal environment for the cells (correct)
  • To transport oxygen to the cells
  • Where is the interstitial fluid present?

    <p>In all tissues except blood</p> Signup and view all the answers

    Who coined the term 'Homeostasis'?

    <p>Walter B. Cannon</p> Signup and view all the answers

    What is the range of fluctuations around the desired value in homeostasis called?

    <p>Set point</p> Signup and view all the answers

    What is the most common type of feedback loop in physiology?

    <p>Negative feedback loop</p> Signup and view all the answers

    What is the set point for extracellular fluid (ECF) glucose concentration?

    <p>90 mg/dl</p> Signup and view all the answers

    Which hormone is released in response to high glucose concentrations to lower ECF glucose levels?

    <p>Insulin</p> Signup and view all the answers

    In Type I diabetes mellitus, there is a lack of which pancreatic cells?

    <p>Beta cells</p> Signup and view all the answers

    Which hormone is released in response to low blood glucose to raise blood glucose levels?

    <p>Glucagon</p> Signup and view all the answers

    Which type of extracellular chemical messenger is produced by endocrine glands and released into the blood plasma?

    <p>Hormones</p> Signup and view all the answers

    Which extracellular chemical messenger acts on adjacent or nearby cells and is produced by cells (NOT neurons or glands)?

    <p>Paracrines</p> Signup and view all the answers

    Which type of extracellular chemical messenger is produced by nerve cells and acts on nerves, glands, or muscles with a relatively rapid, local effect?

    <p>Neurotransmitters</p> Signup and view all the answers

    What do receptors for endogenous extracellular chemical messengers (ligands) bind to and activate?

    <p>Specific target proteins</p> Signup and view all the answers

    What cells are considered to be target cells for hormone receptors?

    <p>Liver, skeletal muscle, adipose &amp; most cells except nerve cells, kidney cells &amp; RBCs</p> Signup and view all the answers

    What is the fluid composition in young adult men?

    <p>55-60% H2O</p> Signup and view all the answers

    Where is the transcellular fluid predominantly found?

    <p>In cavities like pleural fluid</p> Signup and view all the answers

    What percentage of the extracellular compartment is made up of interstitial fluid?

    <p>25%</p> Signup and view all the answers

    Who coined the term 'Homeostasis'?

    <p>Dr. Walter B. Cannon</p> Signup and view all the answers

    What does homeostasis mean in the context of internal environment?

    <p>Fluctuations around a specific value</p> Signup and view all the answers

    What does the extracellular fluid normally provide for the cells to grow and function?

    <p>Oxygen, CO2, pH, electrolytes, water, nutrients</p> Signup and view all the answers

    What is the primary function of insulin in response to high glucose concentrations?

    <p>Increasing glucose uptake from the extracellular fluid into intracellular fluid</p> Signup and view all the answers

    Which type of diabetes mellitus is characterized by the lack of pancreatic β cells?

    <p>Type I diabetes mellitus</p> Signup and view all the answers

    What is the primary function of glucagon in response to low blood glucose levels?

    <p>Activating fatty acid release into the extracellular fluid</p> Signup and view all the answers

    Which of the following is NOT a type of extracellular chemical messenger?

    <p>Histamine</p> Signup and view all the answers

    What is the main function of paracrines among extracellular chemical messengers?

    <p>Act on adjacent or nearby cells</p> Signup and view all the answers

    What do endogenous extracellular chemical messengers bind to and activate?

    <p>Target cells</p> Signup and view all the answers

    What is the primary effect of histamine released locally in response to inflammation?

    <p>Eliminate the irritating agent</p> Signup and view all the answers

    In cell-cell communication, which type of messenger acts on nerves, glands, or muscles with a relatively rapid, local effect?

    <p>Neurotransmitters</p> Signup and view all the answers

    What is the set point for extracellular fluid (ECF) glucose concentration?

    <p>~90 mg/dl</p> Signup and view all the answers

    What percentage of a young adult's body is composed of water?

    <p>70-75%</p> Signup and view all the answers

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