Term
| What are the major cardiovascular functions and what do they do? |
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Definition
*Delivery- delivers oxygen
*Removal- removes CO2
*Transport- transports hormones from one area to another
*Maintenance- maintains pH and temperature
*Prevention |
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Term
| Does the thickness of the myocardium vary? |
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Definition
| Yes it varies directly with stress placed on chamber walls |
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Term
| Which is the most powerful chamber? |
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Definition
| The left ventricle is the most powerful and thus the largest |
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Term
| Does exercise affect the left ventrice size? |
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Definition
| Yes, vigorous exericse increases left ventricle size |
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Term
| What do intercolated disks do? |
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Definition
| The allow impulses to travel quickly in cardiac muscle and allow it to act as one large muscle fiber; all fibers contract together |
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Term
| Does the heart generate its own action potentials? |
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Definition
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Term
| What is the pacemaker of the heart? |
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Definition
| The SA node-- determines what the heart rate will be |
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Term
| What does the PNS do in terms of controlling the heart? |
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Definition
| The PNS acts through the vagus nerve to decrease heart rate and force of contraction |
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Term
| What does the SNS do in terms of controlling the heart? |
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Definition
| SNS is stimulated by stress to increase heart rate and force of contraction |
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Term
| What do epinephrine and norepinephrine do in terms of controlling the heart? |
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Definition
| They are released due to sympathetic stimulation which increases heart rate |
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Term
| What is the resting heart rate in adults? |
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Definition
| between 60 and 85 beats per minute |
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Term
| What can extended endurance training do to resting heart rate? |
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Definition
| It can lower it to 35 beats or less. This lower heart rate is thought to be due to decreased intrinsic heart rate and increased parasympathetic stimulation |
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Term
| What is resting heart rate below 60 bpm? |
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Definition
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Term
| What is resting heart rate above 100 bpm? |
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Definition
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Term
|
Definition
| They are premature ventricular contractions-- feel like skipped or extra beats |
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Term
| What is ventricular tachycardia? |
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Definition
| Three or more consecutive PVCs that can lead to ventricular fibrillation in which contraction of the ventricular tissue is uncoordinated |
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Term
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Definition
| It contracts when the SA node says to and also when they think they ought to by generating them on their own |
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Term
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Definition
| It records the heart's electrical activity and monitors cardiac changes |
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Term
|
Definition
| It is atrial depolarization |
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Term
|
Definition
| Ventricular depolarization and atrial repolarization |
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