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The SA node _____________ fires at regular intervals.
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This is because the cells of the SA node do not have a stable __________ membrane potential like skeletal muscles or neurons.
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Unit 1 Chapter 19
Homework
| Question | Answer |
|---|---|
| The SA node _____________ fires at regular intervals. | spontaneously |
| This is because the cells of the SA node do not have a stable __________ membrane potential like skeletal muscles or neurons. | resting |
| Their membrane potential starts at about ____________ mV and drifts upward. | -60 |
| This gradual, upward drift towards a ____________ is called the pacemaker potential. | depolarization |
| This results from a slow influx of sodium ions without a compensating outflow of _________ ions. | potassium |
| The contraction of the heart begins with autorhythmic depolarization of the ____________ node located in the superior portion of the posterior atrial wall. | sinuatrial |
| From the __________ , the wave of depolarization disperses through the myocardium of the atria. | pacemaker |
| Depolarization then arrives at the ____________ node located in the inferior interatrial septum. | atrioventricular |
| The AV node fires causing the signal to travel into the _____________ as it passes through the __________ . | AV bundle branches interventricular septum |
| Making a U-turn at the apex of the heart, the signals are then carried by the _____________ through the exterior walls of the ventricles. | subendocardial conducting network |
| Electrical ___________ in the heart can be detected by means of electrodes applied to the skin. | currents |
| An instrument called an electrocardiograph _________ these signals and produces a record on a moving paper chart. | amplifies |
| The chart includes three principal deflections above and below the baseline: the P wave, QRS complex, and the ____________ wave. | T |
| The P wave is produced when a signal from the SA node spreads through the atria and ____________ them. | depolarizes |
| The QRS complex is produced when the signal from the AV node spreads through the __________ myocardium and depolarizes the muscle. | ventricular |
| The T wave is generated by ventricular repolarization immediately before ___________ . | diastole |
| Which circuit carries blood from the right ventricle to the lungs for gas exchange and returns it to the left atrium of the heart? | Pulmonary |
| What is the study of the heart and its disorders called? | Cardiology |
| What is the two-layered sac that surrounds the heart called? | Pericardium |
| What are the thick inferior chambers of the heart that pump blood into the arteries called? | Ventricles |
| Which of the following superficially separates the atria from the ventricles? | Coronary sulcus |
| The passage of blood from the atria to the ventricles is regulated by which valves? | Atrioventricular |
| What is the ability to rhythmically depolarize without outside stimulation called? | Autorhythmic |
| Which term refers to relaxation of the heart? | Diastole |
| The sympathetic division innervates the heart by way of the _________blank nerves; the parasympathetic division by way of the _________blank nerves. | cardiac; vagus |
| If the right ventricle begins to pump an increased amount of blood, this soon arrives at the left ventricle, stretches it more than before, and causes it to increase its stroke volume and match that of the right. This is an example of _________blank. | preload |
| Which of the following is a recording of all nodal and myocardial action potentials in the heart? | ECG |
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