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5 Written questions

5 Matching questions

  1. Chordae tendineae
  2. Voltage-gated K+ channels
  3. Digitalis
  4. Third heart sound
  5. Cardioacceleratory center
  1. a Slows and strengthens contractions of the heart muscle by increasing the amount of Ca2+ that enters cardiac muscle cells and by prolonging the action potentials' refractory period.
  2. b Several types exist, each of which opens and closes at different membrane potentials, causing changes in membrane permeability to K+.
  3. c Tendinous strands running from the papillary muscles to the atrioventricular valves. The papillary muscles are attatched by thin, strong connective tissue strings.
  4. d The part of the cardioregulatory center that increases heart rate.
  5. e can be heard in some normal people, particularly those who are thin and young.

5 Multiple choice questions

  1. The Cardiac muscle cell is completely insensitive to further stimulation. Portion of the action potential during which the membrane is insensitive to all stimuli, regardless of their strength.
  2. Electric charge difference inside a plasma membrane, measured relative to just outside the plasma membrane.
  3. the larger, flat part at the opposite end of the heart; the flat portion directed posteriorly and superiorly.
  4. The part that decreases heart rate.
  5. is the pressure the contracting left ventricle must produce to overcome the pressure in the aorta and move blood into the aorta.

5 True/False questions

  1. Intrinsic regulationPrevent clot formation in people who have damaged heart valves or blood vessels or I those who have had a myocardial infarction.


  2. Arterial systolemeans to dilate. Relaxation of the heart chambers, during which they fill with blood; usually refers to ventricular relaxation.


  3. Cardioregulatory centerWhere sensory action potentials are integrated.


  4. Artificial heartis an instrument, placed beneath the skin, equipped with an electrode that extends to the heart and provides an electrical stimulus at a set frequency.


  5. Mean Arterial pressure (MAP)is the total resistance against which blood must be pumped.