Term
|
Definition
| An enlarged vessel composed of a combination of cardiac veins and arteries that empties blood into the right atrium. |
|
|
Term
|
Definition
-oval door
-connects the two atria and allows blood entering the right heart to bypass the pulmonary circuit and the collapsed, nonfunctional fetal lungs |
|
|
Term
|
Definition
-exists between the pulmonary trunk and the aorta
-these shut shortly after birth, completing the separation of right and left sides of heart |
|
|
Term
| A typical ECG has three distinguishable waves or deflections known as? |
|
Definition
|
|
Term
|
Definition
P - P wave - lasts about .08s and results from movement of the depolarization wave from the SA node through the atria
QRS - QRS complex - results from ventricular depolarization and precedes ventricular contraction
T wave - caused by ventricular repolarization and typically lasts about 0.16s. More spread out and has a lower amplitude than QRS wave |
|
|
Term
|
Definition
-CO
-the amount of blood pumped out by EACH ventricle in 1 minute. |
|
|
Term
|
Definition
1) Pericardium - double walled sac that encloses the heart (innermost)
2)Fibrous Pericardium - loosely fitting superficial part of sac, tough dense connective tissue; 1) protects the heart, 2) anchors it to surrounding structures, 3) prevents overfilling of the heart with blood (middle)
3)Serous Pericardium - thin, slippery, two-layer serous membrane (after fp)
4) Parietal Layer - lines the internal surface of the FP
5) Visceral Layer/Epicardium - intergral part of the heart wall (external surface of the heart)
6) Pericardial Cavity - slitlike cavity that contains a film of serous fluid located between parietal and visceral layers |
|
|
Term
|
Definition
1)Epicardium/visceral layer (outermost)
2) Myocardium - middle layer
3) Endocardium (inside the heart) |
|
|
Term
|
Definition
AV Valves
-Tricuspid Valve
-Mitral Valve
Semilunar Valves
-aortic
-pulmonary |
|
|
Term
| Atrioventricular Valves (AV) |
|
Definition
Tricuspid Valve
-right AV valve
-3 flexible cusps
Mitral Valve
-left AV valve
-(bicuspid valve)
-has two flaps |
|
|
Term
|
Definition
-Aortic and Pulmonary
-prevent back flow into associated ventricles
-each SL valve is fashioned from 3 pocketlike cusps
-shaped like a crescent moon |
|
|
Term
| All valves open and close in response to what? |
|
Definition
|
|
Term
|
Definition
-attaches to each AV valve flap
-tiny white collagen cords
-anchor the cuspids to the PAPILLARY MUSCLES protruding from ventricular walls |
|
|
Term
| End Diastolic Volume (EDV) |
|
Definition
| -the amount of blood that collects in a ventricle during diastole |
|
|
Term
| End Systolic Volume (ESV) |
|
Definition
| -the volume of blood remaining in a ventricle AFTER it has contracted |
|
|
Term
|
Definition
-little ear
-small, wrinkled, protruding appendages
-increase the atrial volume somewhat |
|
|
Term
|
Definition
-receiving chambers for blood returning to the heart from the circulation
-small, thin-walled chambers |
|
|
Term
|
Definition
-about the size of a fist
-hollow and cone shaped and is about 250-350 grams less than a pound
-Base is the top part and points toward right shoulder
-Apex is bottom part and points toward left hip
-enclosed within the mediastynum (medial cavity of the thorax) |
|
|
Term
|
Definition
-an abnormally fast heart rate
-more than 100 bpm
-may result from elevated body temp, stress, certain drugs, or heart disease |
|
|
Term
|
Definition
-abnormally slow heart rate
-slower than 60 bpm
-may result from low body temp, certain drugs, or parasympathetic nervous activation |
|
|
