Lecture 2 - Cells and Tissue A+P1
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Questions and Answers

What is the main difference between an electrical gradient and a concentration gradient?

  • Direction of movement
  • Type of substance involved
  • Side of the plasma membrane (correct)
  • Energy requirement

    • What is the primary function of the sodium-potassium pump?

  • To move oxygen into the cell
  • To regulate the electrical gradient
  • To pump Na+ out of the cell and K+ into the cytosol (correct)
  • To facilitate diffusion

    • Which type of tissue is responsible for detecting stimuli and sending signals for movement?

  • Epithelial tissue
  • Connective tissue
  • Muscular tissue
  • Nervous tissue (correct)

    • What is the main function of loose connective tissue?

    <p>To bind tissues together</p> Signup and view all the answers

    What is the term for the movement of substances down their electrochemical gradient without energy input?

    <p>Passive transport</p> Signup and view all the answers

    What type of connective tissue is found in tendons and ligaments?

    <p>Dense connective tissue</p> Signup and view all the answers

    What is the term for the movement of water from an area of high concentration to an area of low concentration?

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

    What is the resting membrane potential of neurons?

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

    Which type of tissue is avascular?

    <p>Epithelial tissue</p> Signup and view all the answers

    What is the function of the cytosol?

    <p>To retain ions and other substances</p> Signup and view all the answers

    What is the primary function of the cell membrane?

    <p>To act as a barrier and regulate the passage of substances</p> Signup and view all the answers

    Which of the following substances is moderately permeable through the plasma membrane?

    <p>Water and urea</p> Signup and view all the answers

    What is the primary mechanism by which macromolecules are transported through the plasma membrane?

    <p>Vesicular transport</p> Signup and view all the answers

    What is the term for the ability of the plasma membrane to allow certain substances to pass through while restricting others?

    <p>Selective permeability</p> Signup and view all the answers

    What is the function of transmembrane proteins in the plasma membrane?

    <p>To act as channels or carriers for specific substances</p> Signup and view all the answers

    What is the structure of the lipid bilayer in the plasma membrane?

    <p>Two layers of fat molecules</p> Signup and view all the answers

    What is the primary function of the electrochemical gradient in the plasma membrane?

    <p>To facilitate the movement of substances down their concentration gradient</p> Signup and view all the answers

    Which type of transport process requires the input of cellular energy to move substances against their concentration gradient?

    <p>Active transport</p> Signup and view all the answers

    What is the primary function of the sodium-potassium pump in the plasma membrane?

    <p>To pump sodium out of the cell and potassium into the cell</p> Signup and view all the answers

    What is the primary characteristic of connective tissue that distinguishes it from other types of tissue?

    <p>It provides support and structure to the body</p> Signup and view all the answers

    What is the primary function of epithelial tissue?

    <p>To cover body surfaces and form glands</p> Signup and view all the answers

    Which type of connective tissue is characterized by its ability to endure considerable stress and heal poorly following injury?

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

    What is the primary function of the cytosol in the cell?

    <p>To facilitate the movement of substances through the cell</p> Signup and view all the answers

    Which type of tissue is responsible for generating heat and facilitating movement?

    <p>Muscular tissue</p> Signup and view all the answers

    What is the primary difference between facilitated diffusion and active transport?

    <p>The energy requirements for transport</p> Signup and view all the answers

    Which type of transport process involves the movement of water from an area of high concentration to an area of low concentration?

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

    What is the purpose of the cell membrane in maintaining homeostasis?

    <p>To regulate the movement of ions and molecules across the cell</p> Signup and view all the answers

    Which of the following is NOT a function of the plasma membrane?

    <p>Metabolic reactions</p> Signup and view all the answers

    What is the significance of selective permeability in the plasma membrane?

    <p>It allows certain molecules to pass through the membrane while restricting others</p> Signup and view all the answers

    How do macromolecules cross the plasma membrane?

    <p>Through vesicular transport</p> Signup and view all the answers

    What is the composition of the lipid bilayer in the plasma membrane?

    <p>Two layers of fatty acids</p> Signup and view all the answers

    What is the role of ion channels in the plasma membrane?

    <p>To regulate the movement of ions across the cell</p> Signup and view all the answers

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