| Question |
Answer |
| 3 layers of the blood vessel. |
Tunica intima, Tunica Media, Tunica Adventitia. |
| Frank-Starling mechanism. |
The more a cardiac muscle is stretched , the harder it will contract. |
| Action Potential |
Relationship between electrolytes (Sodium,Potassium,Calcium) |
| Action Potential change in electrolytes. |
Sodium moves IN, Potassium moves OUT, Calcium moves IN. |
| Portion of heart Right Coronary perfuses. |
Right Heart |
| Portion of heart Left Coronary perfuses. |
Left lateral wall and posterior portion of heart. |
| Location of Pressoreceptor and Chemoreceptors. |
Aortic Arch & Carotid Sinus of Carotid Arteries. |
| Sino-Atrial Node |
Located in right atrium. Intrinsic rate of 60-100. |
| Atrio-Ventricular Node |
Located in right atrium. Causes brief delay in impulse conduction so atria has time to contract and fill ventricles. Perfusion from right coronary. |
| Bundle of His |
Located in intraventricular septum. Intrinsic rate of 40-60. |
| Bundle Branches |
1 on right side. 2-3 on left side. |
| Purkinje Fibers |
Last Pacemaker, Deep fiber network, intrinsic rate or 15-40. |
| Types of 3 leads |
Limb Leads, Augmented Leads, Precordial Leads. |
| Limb Leads |
Bipolar leads that represent the frontal plane activity. |
| Augmented Leads |
(AVL,AVR,AVF) Unipolar leads that allow for increased amplitude by 50% over limb leads. |
| Precordial Leads |
(V1,V2,V3,V4,V5,V6) Unipolar leads that look at horizontal plane of left ventricular. |
| Dr. Einthovens theory |
Left Arm is + or - , Right Arm is - , Left Leg is + , |
| P Wave |
(Atrial Depolarization) 2.5mm in height less then .08 seconds |
| PR Interval |
(Conduction of impulses from Sinus through Atria through AV Junction) .12 - .20 seconds. |
| QRS |
(Ventricular Depolarization) .10 seconds or less. |
| First negative deflection from baseline before R Wave |
Q Wave |
| First positive Deflection, following Q if present. |
R Wave |
| Negative deflection following R Wave |
S Wave |
| ST Segment |
(Begining of Ventricular Repolarization) ST Segments elevated 1mm or more suspect for ventricular ischemia or injury. |
| T Wave |
(Ventricular Repolarization) |
| QT Interval |
(Total ventricular depolarization & repolarization) .40-.44 seconds. Prolonged QT can indicate potential life threatening dysrhythmias. |
| Small ECG Square |
.04 seconds , 1 mm |
| Large ECG Square |
.20 seconds , 5 mm |
| How many seconds in 15 Large Squares? |
3 seconds |
| Ability to initiate an electrical impulse with out nervous system stimulation? |
Automaticity |
| Ability to recieve & respond to an electrical impulse? |
Excitability |
| Ability to contract when stimulated? |
Contractility |
| Strength of cardiac contraction? |
Inotropic |
| Influence on HR + chrontropic effect speed up HR |
Chronotropic |
| Pressure from flow of blood into Atria |
Preload |
| Movement of blood into ventricles w atria contraction |
Atrial Kick |
Science Vocab 147928
