ECG lab

Atria

thin walled chambers that receive blood from veins

ventricles definition

pumping chambers of the heart

right side of the heart pumps BLANK to the BLANK

oxygen poor blood

lungs

the left side of the heart pumps BLANK blood to the BLANK

the three blood vessels that drain into the right atrium

superior vena cava

inferior vena cava

coronary sinus

the four blood vessels that drain into the left atrium are the

pulmonary veins

the blood vessel that takes blood away from the right ventricle is the

pulmonary trunk

the vessel that takes blood away from the left ventricle is the

aorta

the valves between the atria and ventricles are called the BLANK valves specifically teh BLANK valves. Lise between the right atrium and right ventricle and the BLANK

atrioventricular

tricuspid

bicuspid

the pulmonary semilunar valve is located between the BLANK ventricle and the BLANK (vessel)

right

pulmonary trunk

the aortic semilunar vavle is located between the BLANK ventricle and the BLANK (vessel)

left

aorta

the atrioventricular valves close when pressure in the ventricles BLANK

increase

the semilunar valves clsoe wehn pressure in the ventricles

decreases

drop of blood pathway

1. superior vena cava

2. right atrium

3. tricuspid valve

4. right ventricle

5. pulmonary valves

6. pulmonary trunk

7. pulmonary arteries

8. pulmonary capillaries in lungs

9. pulmonary veins

10. left atrium

11. mitral valve

12. left ventricle

13. aortic valve

14. aorta vessel

cardiac muscle cells are branched cells that are connected by special junctions called the

intercalated disc

pathway of electrical impulses through conduction

• SA node

• AV node

• AV bundles

• bundle branches

• purkinje fibers

the pacemaker of the heart is the BLANK located in the BLANK

SA node

right atrium

the cardiac centers are located in the BLANK of the brain

medulla oblongata

the sinoatrial node is located in the

right atrium

intrinsic conduction system allows

the hear to contract without neural stimulation

auto-rhythmic cells specialize

to conduct action potentials

autorhythmic cells are located in

1. SA node in the right atrium

2. AV node in the interatrial septum

3. AV bundle passes through the fibrous skeleton

4. right and left bundle branches in the inter ventricular septum

5. purkinje fibers in the walls of the ventricles

sinoatrial is located

in the upper portion of the right atrium

SA node depolarization frequency

70-75

what is known as the pacemaker for the heart

SA node

AV node is located at

the base of the interatrial septum

AV node function

delay spread of depolarization to the ventricles

delay in conduction allows

atria to completely contract before ventricular excitation occur

what prevents spread of depolarization from atria to ventricles

fibrous skeleton

what is the electrical connection between the atria and the ventricles

atrioventricular bundle

what spreads depolarization to the myocardial cells of the ventricles

purkinje fibers

P-wave

depolarization of atria

QRS wave

period of ventricular depolarization

T-wave

period of ventricular repolarization

the pause

P-R

Q-T interval

ventricular depolarization and repolarization

ECG small box time

.04

ECG large box time

.2

the atrioventricular node is located in the

interatrial septum

the atrioventricular bundle is located

interventricular septum

the right and left bundle branches are located in the

interventricular septum

the purkinje fibers are located in the

ventricular walls

what part of the conduction system serves as the electrical connection between the atrial and the ventricles

atrioventricular bundle

what part of the conduction system serves as the pacemaker

sa node

what part of the conduction system is responsible for exciting the contractile cells of teh ventricle

purkinje

electrical events that occur: p-wave

the depolarization of the atria

electrical events that occur: QRS

ventricular depolarization

electrical events that occur: T-wave

ventricular repolarization

the specialized junctions between contractile cells are called the

intercalated discs

intercalated discs contain electrical synapses called

gap junctions

an abnormally fast heart rate is called

tachycardia

an abnormally slow heart rate is called

brachycardia

an abnormally long P-R interval indicates a condition called

first degree heart block

Leads I, II, III are collectively called the

electrocardiograph lead

which ecg wave must occur before ventricular contraction

QRS

which ECG deflection must occur before the atria can contract

P-wave

what does the P-R interval measure

beginning of atrial depolarization to beginning of ventricular depolarization

what does the QT interval measure

ventricular depolarization and depolarization

pathway of conduction from atria to ventricles

1. SA node

2. AV node

3. av bundle

4. bundle branches

5. purkinje fibers