WK 4: Cell Homeostasis
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Questions and Answers

What is the primary function of buffers in the maintenance of normal cellular pH?

  • To increase the concentration of H+ ions
  • To bind excess H+ ions (correct)
  • To regulate the concentration of bicarbonate
  • To control the activity of enzymes

    • Which of the following is an example of a negative feedback mechanism?

  • Control of blood pressure (correct)
  • Childbirth
  • Control of blood glucose regulation
  • Regulation of heart rate

    • What is the set point of normal cellular pH?

  • 7.6
  • 7.4 (correct)
  • 7.0
  • 7.2

    • Which component of the homeostatic control mechanism determines the appropriate response to a stimulus?

    <p>Control centre (A)</p> Signup and view all the answers

    What is the result of a marked change in [H+]?

    <p>Decrease in enzymatic activity (A)</p> Signup and view all the answers

    What is the primary goal of homeostasis in the body?

    <p>To maintain a relatively constant internal environment despite changes in the external environment (D)</p> Signup and view all the answers

    Which of the following is an example of a positive feedback mechanism?

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

    What is the term for the internal environment of the body?

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

    What percentage of the body is made up of water in an average young male?

    <p>60% (B)</p> Signup and view all the answers

    What is the main function of homeostasis in regulating the body's metabolic rate?

    <p>To maintain a constant metabolic rate despite changes in the external environment (B)</p> Signup and view all the answers

    What is the term for the ability of cells to regulate their volume?

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

    What is the term for the relatively constant temperature of the body?

    <p>Body temperature (C)</p> Signup and view all the answers

    What is the normal plasma ion concentration range in terms of osmolarity?

    <p>180-290 (B)</p> Signup and view all the answers

    What happens to the osmolarity of the external environment during exercise?

    <p>It increases (C)</p> Signup and view all the answers

    What is the effect of a decrease in glucose 6 dehydrogenase on NADPH production?

    <p>It decreases NADPH production (A)</p> Signup and view all the answers

    What type of solution is 0.45% saline compared to 0.9% saline?

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

    What is the primary mechanism of water movement across a membrane?

    <p>Passive diffusion (A)</p> Signup and view all the answers

    What is the name of the protein involved in water transport across a membrane?

    <p>Aquaporin 1 (D)</p> Signup and view all the answers

    What percentage of body weight is composed of total body water?

    <p>60% (C)</p> Signup and view all the answers

    What is the osmolarity of the extracellular fluid (ECF) and intracellular fluid (ICF)?

    <p>290-300 mOsm/kg (D)</p> Signup and view all the answers

    What happens to the movement of water when the ion concentration outside the cell increases?

    <p>Water moves out of the cell (A)</p> Signup and view all the answers

    What is the approximate volume of plasma in the body?

    <p>3.5 L (C)</p> Signup and view all the answers

    What is the primary function of the equilibrium between the extracellular and intracellular fluid spaces?

    <p>To maintain cellular homeostasis (C)</p> Signup and view all the answers

    What is the approximate percentage of body weight composed of interstitial fluid?

    <p>15% (A)</p> Signup and view all the answers

    What drives the movement of H2O into the extracellular space?

    <p>Hydrostatic pressure (B)</p> Signup and view all the answers

    What is the net result of Na+/K+ ATPase activity?

    <p>Decreased sodium and increased potassium inside the cell (B)</p> Signup and view all the answers

    What is the response of cells to cell shrinking?

    <p>Regulatory volume increase (A)</p> Signup and view all the answers

    What is the consequence of rapid fluid replacement during dehydration?

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

    What is the term for the process by which cells respond to an increase in extracellular osmolarity?

    <p>Regulatory volume increase (C)</p> Signup and view all the answers

    What is the primary function of Na+/K+ ATPase?

    <p>To regulate electrolyte composition (D)</p> Signup and view all the answers

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