5003- Midterm.docx - What causes the rapid change in the resting membrane potential to initiate an action potential Question 1 options Potassium gates

5003- Midterm.docx - What causes the rapid change in the...

This preview shows page 1 - 4 out of 18 pages.

What causes the rapid change in the resting membrane potential to initiate an action potential? Question 1 options: Potassium gates open and potassium rushes into the cell, changing the membrane potential from negative to positive Sodium gates open and sodium rushes into the cell, changing the membrane potential from negative to positive. Sodium gates close, allowing potassium into the cell to change the membrane potential from positive to negative. Potassium gates close, allowing sodium into the cell to change the membrane potential from positive to negative. Save Question 2 (5 points) What is a consequence of leakage of lysosomal enzymes during chemical injury? Question 2 options: Enzymatic digestion of the nucleus and nucleolus occurs, halting deoxyribonucleic acid (DNA) synthesis. Influx of potassium ions into the mitochondria occurs, halting the adenosine triphosphate (ATP) production. Edema of the Golgi body occurs, preventing the transport of proteins out of the cell. Shift of calcium out of the plasma membrane occurs, destroying the cytoskeleton. Save Question 3 (5 points) In hypoxic injury, sodium enters the cell and causes swelling because:
Image of page 1
Question 3 options: The cell membrane permeability increases for sodium during periods of hypoxia. Adenosine triphosphate (ATP) is insufficient to maintain the pump that keeps sodium out of the cell. The lactic acid produced by the hypoxia binds with sodium in the cell. Sodium cannot be transported to the cell membrane during hypoxia. Save Question 4 (5 points) What mechanisms occur in the liver cells as a result of lipid accumulation? Question 4 options: Obstruction of the common bile duct, preventing the flow of bile from the liver to the gallbladder Increased synthesis of triglycerides from fatty acids and decreased synthesis of apoproteins Increased binding of lipids with apoproteins to form lipoproteins Increased conversion of fatty acids to phospholipids Save Question 5 (5 points) Which solution is best to use when cleaning a wound that is healing by 101. During an Immunoglobulin E (IgE)-mediated hypersensitivity reaction, the degranulation of mast cells is a result of which receptor action? Question 5 options: Histamine bound to H2 Chemotactic factor binding to the receptor
Image of page 2
Epinephrine bound to mast cells Acetylcholine bound to mast cells Save Question 6 (5 points) What is the mechanism that results in type II hypersensitivity reactions? Question 6 options: Antibodies coat mast cells by binding to receptors that signal its degranulation, followed by a discharge of preformed mediators. Antibodies bind to soluble antigens that were released into body fluids, and the immune complexes are then deposited in the tissues. Cytotoxic T (Tc) lymphocytes or lymphokine-producing helper T 1 (Th1) cells directly attack and destroy cellular targets.
Image of page 3
Image of page 4

You've reached the end of your free preview.

Want to read all 18 pages?

  • Fall '15
  • Options, Adenosine, infarction

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture