Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
| How much pericardial fluid is in the heart? |
|
Definition
|
|
Term
| Which "heart" has more force? |
|
Definition
| the left ventricle (6 to 7X) |
|
|
Term
|
Definition
Relaxation- ventricles fill w/blood via atrioventricular valves.
semilunar valves are closed and chordae tendineae are loose |
|
|
Term
|
Definition
contraction.
AV valves: closed
Papillary m: contract
semilunar valves: open |
|
|
Term
| Describe the characteristics of cardiac muscle tissue |
|
Definition
intercalated discs: gap junctions
nuclei
sarcomeres w/myofibrils |
|
|
Term
| 2 similarities between cardiac and skeletal muscle |
|
Definition
1. action potential leads to appearance of Ca among myofibrils
2. binding of Ca to troponin on thin filaments to initiate contraction |
|
|
Term
| 3 differences between cardiac and skeletal muscle |
|
Definition
1. Nature of action potential
2. source of the Ca
3. duration of contraction (longer for heart) |
|
|
Term
| Basic steps of action potential in cardiac muscle |
|
Definition
1. Na enters => rapid depolarization (Na channels close)3-5msec
2. Ca enters => Plateau (Ca channels close)175msec
3. K out of cell => Repolarization (K channels close) 75msec |
|
|
Term
| 3 characteristics of cardiac myocyte contractility |
|
Definition
1. cardiac m. is excitable
2. cardiac myocytes are autorhythmic
3. depolarize spontaneously w/out external stimulation |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Ventricular depolarization |
|
|
Term
|
Definition
| Ventricular repolarization |
|
|
Term
|
Definition
|
|
Term
|
Definition
| no P wave (SA node not working properly) |
|
|
Term
|
Definition
| atria and ventricles not communicating |
|
|
Term
|
Definition
| current starting at bottom (assumption of blood being pumped) |
|
|
Term
| Ventricular premature complex |
|
Definition
| Came in early w/out signal from p wave |
|
|
Term
|
Definition
| electrical activity occurring at random (person in unconscious) |
|
|
