General Physiology Quiz: Cell Membrane and Organelles
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Questions and Answers

What is the most important characteristic of a water-insoluble substance in governing its diffusibility through a cell membrane?

  • Electrical charge
  • Molecular weight
  • Hydrated diameter
  • Lipid solubility (correct)

    • Why are mitochondria usually the most abundant organelles in the cell?

  • Mitochondrion is the control center of the cell
  • Digestive enzymes are contained within the mitochondria
  • These structures shuttle proteins and other substances between the E.R. and Golgi apparatus
  • Practically all cellular processes require ATP as an energy (correct)

    • How are simple diffusion and facilitated diffusion alike?

  • Can work in the absence of ATP
  • Require some carrier mechanism for transport (correct)
  • Can transport material against a concentration gradient
  • Display saturation kinetics

    • Which one of the following accomplishes secondary active transport?

    <p>The secretion of H ions by the renal distal tubule</p> Signup and view all the answers

    Which of the following is NOT part of the extracellular fluid compartment?

    <p>Cerebrospinal fluid</p> Signup and view all the answers

    Which body fluid compartment would represent about 40% of the body weight?

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

    In a muscle fiber, what is the main function of tropomyosin?

    <p>Normally covers the binding site for myosin</p> Signup and view all the answers

    In smooth muscle, which of the following plays a role in the regulation of contraction?

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

    As the Na-K pump functions in a neuron membrane, how many Na ions are pumped out for every K ion pumped in?

    <ol start="2"> <li>1</li> </ol> Signup and view all the answers

    Stimulation of the parasympathetic portion of the autonomic nervous system causes:

    <p>Increase gastrointestinal function</p> Signup and view all the answers

    The neuronal centers for regulating visceral functions particularly coughing, respiration, blood pressure, and heart rate are in the:

    <p>Medulla oblongata</p> Signup and view all the answers

    Which play an important role in determining the orientation of the head?

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

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