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5 Written questions

5 Matching questions

  1. Pacemaker Potential
  2. Chemoreceptor reflexes
  3. Left atrium
  4. Digitalis
  5. QRS complex
  1. a has 4 relatively uniform openings that receive blood from the 4 pulmonary veins from the lungs.
  2. b The generation of action potentials in the SA node results when a spontaneously developing local potential, reaches threshold. Changes in ion movement into and out of the pacemaker cells cause this.
  3. c is composed of 3 individual waves: Q, R, and S waves. It results from ventricular depolarization and signals the onset of ventricular contraction.
  4. d help regulate the heart's activity. They detect a decrease in blood oxygen, an increase in carbon dioxide, or a decrease in pH and produce an increased rate and depth of respiration and, by means of the vasomotor center, vasoconstriction.
  5. e 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.

5 Multiple choice questions

  1. The AV valve between the right atrium and right ventricle has 3 cusps.
  2. The thick middle layer of the heart, is composed of cardiac muscle cells and is responsible for the heart's ability to contract.
  3. Specialized plasma membrane structures hold the cells together.
  4. which project to the heart as cardiac nerves.
  5. The volume is decreased to 50-60 mL.

5 True/False questions

  1. Pulmonary Semilunar Valveis located in the aorta.


  2. Atrioventricular (AV) nodeis medial to the right atrioventricular valve. Small node of specialized cardiac muscle fibers that gives rise to the atrioventricular bundle of the conduction system of the heart.


  3. End-diastolic volumethe ventricles are filled with 120-130 mL of blood.


  4. Period of isovolumetric contractionAs contraction proceeds, ventricular pressures continue to rise, but no blood flows from the ventricles because all the valves are closed. because the volume of the blood in the ventricles doesn't change, even though the ventricles are contracting.


  5. EndocarditisShort trunk that receives most of the veins of the heart and empties into the right atrium.