Term
| Which part of the myocardium wall is thickest? |
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Definition
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Term
| What is the intrinsic rate of the spontaneous rythmic myocardial cells of the SA node? |
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Definition
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Term
| What is the significance of the delay of the electrical conduction as it passes through the AV node? |
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Definition
| Increased time for atrial emptying and ventricle filling |
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Term
| What is the effect of the parasympathetic drive to the SA node and the subsequent release of acetylcholine? |
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Definition
| Hyperpolarization and decrease in heart rate |
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Term
| What explains the initial increase in heart rate as exercise begins? |
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Definition
| Decreased parasympathetic neural drive |
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Term
| What event does the ST segment of the EKG represent in the cardiac conduction cycle? |
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Definition
| Ventricular repolarization |
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Term
| Why can Bradycardia and/or Tachycardia create symptoms of dizziness, fatigue, and light-headedness? |
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Definition
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Term
| How much time of the cardiac cycle is spent in systole? |
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Definition
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Term
| What is the ejection fraction (%) for a person with a SV of 90mL and an ESV of 50mL? (round answer to nearest whole number) |
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Definition
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Term
| What "drives" blood flow through the cardiovascular system? |
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Definition
|
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Term
| How are the changes in the distribution of cardiac output Primarily mediated? |
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Definition
| Aortic and vena cava constriction and dilation |
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Term
| Which of the following is NOT TRUE in regards to Control of Blood Flow? |
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Definition
| Increased sympathetic stimulation increases vasodilation |
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Term
| At rest, most of the blood volume is contained in the_____________. |
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Definition
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Term
| What accounts for most of the blood volume? |
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Definition
| Water and red blood cells |
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Term
| Which of the following is the process of moving air into and out of the lungs? |
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Definition
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Term
| What are the consequences of the Respiratory Pump? |
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Definition
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Term
| The amount of air leaving the lungs in a single max exhale after a max inhale is called____________________. |
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Definition
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Term
| What is the most critical factor for gas exchange between blood and tissues? |
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Definition
| Pressure Gradient of the gas. |
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Term
| Why does hemoglobin become fully saturated with oxygen on the right side of the Oxyhemoglobin dissociation curve? |
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Definition
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|
Term
| Why does the AV-O2diff increase during exercise? |
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Definition
|
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Term
| What drives blood flow to skeletal muscles during exercise? |
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Definition
|
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Term
| What determines the inherent strength of contraction (intrinsic contractility) of the myocardium? |
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Definition
| Amount of calcium released in myocardium. |
|
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Term
| What affect does vagal tone have on the heart? |
|
Definition
| Decreased HR and force of contraction. |
|
|
Term
| Which of the following would be considered "normal" during exercise? |
|
Definition
| Tachycardia (heart rate that exceeds normal HR). |
|
|
Term
| Which of the following plays the most important role in blood flow during exercise? |
|
Definition
|
|
Term
| Which is the most important variable controlling resistance to blood flow? |
|
Definition
|
|
Term
| Prior to the onset of exercise, where is most of your blood volume located? |
|
Definition
|
|
Term
| What determines the amount of O2 in arterial blood? |
|
Definition
| The hemoglobin concentration and its oxygen saturation |
|
|
Term
| What does the partial pressure of oxygen tell us? |
|
Definition
| Amount of dissolved oxygen. |
|
|
Term
| What is the major reason hemoglobin releases its oxygen in the muscle capillary? |
|
Definition
|
|
Term
| What drives blood flow to skeletal muscles during exercise? |
|
Definition
|
|
Term
| What determines the inherent strength of contraction (intrinsic contractility) of the myocardium? |
|
Definition
| Amount of calcium released in myocardium. |
|
|
Term
| What affect does vagal tone have on the heart? |
|
Definition
| Decreased HR and force of contraction. |
|
|
Term
| Which of the following would be considered "normal" during exercise? |
|
Definition
| Tachycardia (heart rate that exceeds normal HR). |
|
|
Term
| Which of the following plays the most important role in blood flow during exercise? |
|
Definition
|
|
Term
| Which is the most important variable controlling resistance to blood flow? |
|
Definition
|
|
Term
| Prior to the onset of exercise, where is most of your blood volume located? |
|
Definition
|
|
Term
| What determines the amount of O2 in arterial blood? |
|
Definition
| The hemoglobin concentration and its oxygen saturation |
|
|
Term
| What does the partial pressure of oxygen tell us? |
|
Definition
| Amount of dissolved oxygen. |
|
|
Term
| What is the major reason hemoglobin releases its oxygen in the muscle capillary? |
|
Definition
|
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