Chapter 42 Review: Circulation and Gas Exchange


  1. Which of the following is the pacemaker?
    1. AV noce
    2. SA node
    3. bundle branches
    4. Purkinje fibers
    5. aorta
  2. Heart rhythm is controlled by the following EXCEPT:
    1. SA node
    2. AV node
    3. superrior valve
    4. bundle branches
    5. Purkinje fibers
  3. Mammalian hearts have ________ chamber(s).
    1. one
    2. two
    3. three
    4. four
    5. five
  4. Arteries carry blood
    1. that is oxygen-rich.
    2. that is oxygen-poor.
    3. from the lungs.
    4. to the heart.
    5. away from the heart.
  5. The rushing sound heard through a stethoscope is
    1. systolic pressure.
    2. diastolic pressure.
    3. the diaphragm contracting.
    4. the SA node contracting.
    5. the AV node contracting.
  6. Sea stars breathe through
    1. lungs.
    2. hearts.
    3. gills.
    4. tube feet.
    5. skin.
  7. Blood is pumped into the large arteries during
    1. ventricular systole.
    2. atrial systole.
    3. ventricular diastole.
    4. ventricular diastole.
    5. cardiac arrest.
  8. Oxygen-________ blood enters the heart at the _______ _______.
    1. rich, left atrium
    2. poor, left atrium
    3. rich, right atrium
    4. poor, right ventricle
    5. rich, right ventricle