How Does the Heart Work

The space between the layers of the pericardium that contains fluid to reduce friction

• pericardial cavity
• epicardium
• endocardium
• myocardium

One complete heartbeat

• ECG
• systole
• diastole
• cardiac cycle

The name of the arteries that feed the heart muscle

• capillaries
• coronary
• chordae tendineae
• coronary sinus

The inner layer in the wall of the heart

• endocardium
• myocardium
• epicardium
• septum

The fibrous chords that attach to the cusps of the valves

• Purkinje fibers
• chordae tendineae
• papillary muscles
• cusps

What is the main organ of the circulatory system?

• bladder
• heart
• veins
• arteries

SA node is known by this name as it control the rate of the heartbeat

• AV node
• Purkinje fibers
• SV node
• pacemaker

A recording of electrical changes that occur during the cardiac cycle

• blood pressure reading
• ECG
• QRS wave
• t Wave

Oxygen-poor blood flows into what atrium? 

• left
• bottom
• right
• top

What is the aorta?

• a muscular tube
• regulate blood flow
• a small vein
• the main artery of the body