Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account

Electrocardiography Essentials Chapter 3


the heart muscle


one of the two top chambers of the heart, that receives blood from the large veins and then pumps blood into the lower chambers of the heart

superior vena cava

the main vein that drains blood from the upper part of the body into the right atrium of the heart

inferior vena cava

the main vein that drains blood from the lower part of the body into the right atrium of the heart

pulmonary vein

one of the two large vessels that returns oxygenated blood from the lungs to the left atrium


one of the two large muscular pumping chambers of the heart located inferior to the atria


the large artery that receives blood from the left side of the heart and distributes the blood to the rest of the body

6 steps of Pulmonary circulation

1a. superior vena cava
1b. inferior vena cava
2. right atrium
3. tricuspid valve
4. right ventricle
5. pulmonary valve (semilunar)
6a. right pulmonary arteries
6b. left pulmonary arteries

6 steps of systemic circulation

7a. left pulmonary veins
7b. right pulmonary veins
8. left atrium
9. bicuspid valve (mitral)
10. left ventricle
11. aortic valve
12. aortic arch

tricuspid valve

the three-cusp valve which controls the flow of blood between the right atrium and right ventricle

pulmonic valve

the valve that is in the right ventricle and which separates the ventricle from the pulmonary artery

mitral valve

the two-cusp valve separation the left atrium from the left ventricle

aortic valve

the valve on the left side of the heart that opens to allow blood to flow from the left ventricle into the aorta

pericardial sac

the fibrous covering which completely encloses and protects the heart


an ion or a small particle that is positively or negatively charged, such as sodium (Na+), potassium (K+), or chloride (Cl-)


fluid and particles outside of and surrounding the cell


within a cell

cellular membrane

a layer of protein that surrounds a cell and keeps it separated from the surrounding fluid and cells

sinoatrial node "SA Node"

the natural pacemaker of the heart, located in the upper part of the right atrium


the resting state, meaning that there is a balance between the electrical charges on both sides of the cellular membrane and no movement of ions across the membrane occurs. "ready for action"


a current, or wave of electricity that is created when sodium and potassium trade places across the cellular membrane. "active"


when sodium and potassium again change places across the cellular membrane returning to their original places. "recharging"

atrioventricular node "AV Node"

special conductive tissue located in the lower right atrium that conducts electrical impulses from the atria to the ventricles

bundle of His

special conductive tissue in the middle of the septum of the heart, or inter-ventricular septum, that allows smooth and rapid conduction of the electrical impulse from the AV node to the ventricle

bundle branches

special conductive tissue fibers that extend from the Bundle of His and into the left and right ventricle

purkinje fibers

conduction fibers that branch off from the bundle branches and deliver the electrical stimulus to the ventricles, causing the ventricles to contract


the period of time in which the heart muscle is contracting


the period of time when the heart muscle is relaxed

5 steps of the conduction system

1. SA Node
2. AV Node
3. Bundle of His
4. bundle branches (left and right)
5. Purkinje fibers


relating to the system of blood vessels

vena cava

large vein returning deoxygenated blood to the right side of the heart


the upper chambers


relating to the lungs


lower chambers or main pumping chambers


very small charged particle

cardiac cycle

the series of electrical and mechanical events that comprise each heart beat

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording