CHAPTER 9

What is wrong with this strip?

• Tachycardia
• Elevated ST segment
• No P wave
• Wide QRS complex

Which letter/s of the ECG shows the ventricles contracting.....

• P
• QRS
• ST

Which of the following describes the QRS wave?

• Ventricular depolarization

• ventricular contraction

• ventricular repolarization

• none of these

Which of the following describes the T wave?

• atrial contraction

• ventricular contraction

• ventricular repolarization

• none of these

Which of the following describes the P wave?

• atrial contraction

• ventricular contraction

• ventricular repolarization

• none of these

Which of these physical factors impacts the heart rate?

• Age

• Body Temperature

• Gender

• Exercise

Factor that modifies heart rate: Epinephrine and thyroxine speed the HR.

(Excess/lack of Ca, Na, and K ions also modify heart activity)

• Neural (ANS) controls

• Hormones and ions

• Physical Factors

Factor that modifies heart rate: Sympathetic nervous system speeds up HR & parasympathetic nervous system slows HR

• Neural (ANS) controls

• Hormones and ions

• Physical Factors

Which order of events is correct for the cardiac cycle?

• 1. Atrial systole

  2. Atrial diastole (filling)

  3. Isovolumetric relaxation

  4. Ventricular Systole (ejection)

  5. Isovolumetric contraction

• 1. Atrial diastole (filling)

  2. Atrial systole

  3. Isovolumetric relaxation

  4. Ventricular Systole (ejection)

  5. Isovolumetric contraction

• 1. Atrial diastole (filling)

  2. Atrial systole

  3. Isovolumetric contraction

  4. Ventricular Systole (ejection)

  5. Isovolumetric relaxation

Systole = __________

Diastole = ___________

• contraction;

  relaxation

• relaxation;

  contraction