Heart lecture notes
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Created by:
Megan_Levi on October 1, 2012
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25 terms
Terms | Definitions |
|---|---|
 What 2 cells types is the heart composed of? | Conduction and contractile cells |
| Two layers of the pericardium? | Parietal and visceral |
| What is cardiac tamponade? | Too much fluid |
| What is Pericarditis? | Inflammation of the pericardium (friction) |
| What do the valves ultimately do? | Isolates ventricles |
| What happens when both the valves are closed? | Isometric period |
| What is diastole? | Heart relaxation |
| What is systole? | Heart contraction |
| Explain the conduction cells | 10% of heart, includes SA and AV nodes |
| Explain the contractile cells. | 90% of heart, includes actin and myosin |
| What do conduction cells lack? | A resting membrane |
| What is the p wave? | Atrial depolarization |
| What is the qrs segment? | Ventricle depolarization |
| What is the t wave? | Ventricle repolarization |
| Formula for cardiac output? | Heart rate x stroke volume |
| Formula for cardiac reserve? | COmax/ COrest |
| Which ventricle is the stroke volume related to? | Left |
| How is your heart rate different from what the pacemaker gives off? | Nervous system modifies it with modifiers |
| How does the parasympathetic modify heart rate? | Uses vagal tone to induce SA node |
| When potassium leaves the cell, it _______ it. | Hyperpolarizes |
| When sodium enters the cell, it ______ it. | Depolarizes |
| What is the neurotransmitter for the sympathetic? | Norepinephrine |
| What is the neurotransmitter for the parasympathetic? | Ach |
| What is ectopic foci? | Region of spontaneous firing |
| What is heart block? | Failure of the conduction system |
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