Heart Physiology and Intrinsic Conduction System

Which part of the intrinsic conduction system is known as the "pacemaker" of the heart?

• atrioventricular (AV) node

• bundles of His

• Purkinje fibers

• sinoatrial (SA) node

Which part of the intrinsic conduction system connects the atria to the ventricles, and when damaged can cause various degrees of heart block?

• atrioventricular (AV) node

• bundles of His

• Purkinje fibers

• sinoatrial (SA) node

How is the cardiac cycle recorded?

• electrocardiogram (ECG or EKG)

• electroencephalogram (EEG)

• MRI image

• myogram

Which of the following is the correct order of the intrinsic conduction system?

• AV NODE - SA NODE - PURKINJE FIBERS - BUNDLES OF HIS

• SA NODE - AV NODE - PURKINJE FIBERS - BUNDLES OF HIS

• SA NODE - AV NODE - BUNDLES OF HIS - PURKINJE FIBERS

• AV NODE - SA NODE - BUNDLES OF HIS - PURKINJE FIBERS

When blood pressure is taken, the number on the top is the pressure during systole. This correlates with which of the following?

• ventricular contraction

• ventricular relaxation

• atrial contraction

• atrial relaxation

When blood pressure is taken, the number on the bottom is the pressure during diastole. This correlates with which of the following?

• ventricular contraction

• ventricular relaxation

• atrial contraction

• atrial relaxation

Which of the following correlate with the sounds of the cardiac cycle heard with a stethoscope?

• atrial contraction

• the opening of valves

• the closing of valves

• electrical impulse conduction

Respiratory gases, wastes, hormones, nutrients, and other items carried in the blood are exchanged between blood and tissues through which of the following?

• arteries

• capillaries

• venules

• veins

When blood is traveling away from the heart, in which of the following would you find it?

• arteries

• capillaries

• venules

• veins

When blood is traveling toward the heart, in which of the following would you find it?

• arteries

• capillaries

• arterioles

• veins