Conduction System & Hemodynamics

The conduction system is the heart's source of electricity.

• True

• False

Atrial systole & ventricular systole occur simultaneously.

• True

• False

Which of the following statements regarding electrical impulses is not true?

• Initiated by pacemaker cells

• Stimulate relaxation of the heart

• Myocardial cells respond by shortening, causing contraction

• Transferred through the heart in a wavelike motion, by the electrical conduction system

• Stimulate contraction of the heart

Which of the following statements about myocardial cells is true?

• Possess a short refractory period

• Not unique

• Signal the heart to relax (recover)

• Do not require an external stimulus to spontaneously depolarize at periodic intervals

Which conduction system property is defined by the ability of the heart cells to receive and transmit an electrical impulse; aka the 'journey'?

• Automaticity

• Conductivity

• Excitability

• Contractility

Which conduction system property is defined by the ability of the heart muscle cells to respond to an impulse or stimulus; aka the 'reaction'?

• Automaticity

• Conducitivity

• Excitability

• Contractility

Which conduction system property is defined by the ability of the heart to spontaneously initiate an electrical impulse at periodic intervals without requiring an external stimulus; aka the 'beginning'?

• Automaticity

• Conducitivity

• Excitability

• Contractility

Which conduction system property is defined by the ability of the heart muscle cells to shorten in response to an electrical impulse; aka the 'contraction'?

• Automaticity

• Conductivity

• Excitability

• Contractility

Blood must travel from the atria --> ventricles --> great arteries.

• True

• False

Which conduction pathway is considered the primary pacemaker?

• SA node

• AV node

• Bundle of His

• Purkinje fibers