BIOL*1080 Lecture 7 MIDTERM 1 Quiz
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Questions and Answers

What is the main function of connexons in gap junctions?

  • Transport large molecules between cells
  • Facilitate indirect communication through nanotubes
  • Allow direct communication between adjacent cells (correct)
  • Act as chemical messengers
  • Which type of intercellular communication involves gap junctions?

  • Indirect communication
  • Mechanosignals
  • Direct communication (correct)
  • Chemical messengers
  • What is a characteristic feature of the pore size in gap junctions?

  • Very small (correct)
  • Very large
  • Variable depending on cell type
  • Non-existent
  • Which of the following molecules can pass through gap junctions?

    <p>Sugars, amino acids, &amp; ions</p> Signup and view all the answers

    In intercellular communication, what do connexons permit between cells?

    <p>Passage of small molecules</p> Signup and view all the answers

    What type of intercellular communication involves the transfer of nucleic acids and small organelles between cells?

    <p>Membrane nanotubes</p> Signup and view all the answers

    Which intercellular communication type can be acutely regulated by phosphorylation and dephosphorylation?

    <p>Gap junctions</p> Signup and view all the answers

    In which type of muscle, such as cardiac muscle, are intercalated disks found, allowing for rapid and coordinated propagation of action potentials?

    <p>Cardiac muscle</p> Signup and view all the answers

    Which mechanism involves the conversion of mechanical stimuli into a cellular response?

    <p>Mechanosignal transduction</p> Signup and view all the answers

    What can excessive pulsatile and shearing stresses from blood flow on arterial endothelial cells mediate?

    <p>Vascular inflammation</p> Signup and view all the answers

    Which communication type involves indirect intercellular signaling through chemical messengers?

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

    Which type of chemical messenger acts on a nearby cell?

    <p>Paracrine signaling</p> Signup and view all the answers

    What type of hormones typically dissolve in plasma and do not require a carrier for transportation?

    <p>Hydrophilic hormones</p> Signup and view all the answers

    Which type of hormone needs a carrier for transportation as they cannot dissolve in plasma?

    <p>Steroid hormones</p> Signup and view all the answers

    What is a key requirement for neurotransmitter signals to be tightly controlled?

    <p>Auto shutoff mechanism</p> Signup and view all the answers

    Which type of communication is considered more direct in terms of intercellular signaling?

    <p>Paracrine signaling</p> Signup and view all the answers

    What is the storage characteristic of hydrophobic hormones like cortisol?

    <p>They are made on demand</p> Signup and view all the answers

    What is the goal of receptor amplification?

    <p>To change the overall profile of cellular protein/enzymatic activity</p> Signup and view all the answers

    Where do hydrophilic chemical messengers typically bind?

    <p>Cell surface (plasma membrane)</p> Signup and view all the answers

    How do hydrophobic chemical messengers primarily exert their effects?

    <p>By turning on genes to make new proteins</p> Signup and view all the answers

    What is the role of Student Accessibility Services (SAS) on campus?

    <p>Supporting students with well-being services</p> Signup and view all the answers

    Where can students find support related to health and performance on campus?

    <p>Student Health Services Health &amp; Performance Centre (HPC)</p> Signup and view all the answers

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