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18 Cards in this Set
- Front
- Back
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What is the Cardiac cycle and how long does each phase last? |
Atrial systole, ventricular diastole (0.15s) Atrial diastole, ventricular systole (0.30s) Atrial diastole, ventricular diastole (0.40s) |
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What is the pacemaker of your heart? |
The sino-atrial node |
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What happens during a cardiac cycle? |
And electrical signal spreads to myocardium of the 2 atria & to the atrial-ventricular node, the A-V node transmits this signal to the ventricles |
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What fibers do the electrical signals travel through during the cardiac cycle? |
The purkinje fibers |
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What are the three different types of waves that can be detected by an electrocardiogram? |
P-wave = atrial systole QRS complex = ventricular systole T-wave = atrial and ventricular diastole |
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What the “The pulse”? |
Expansion & contraction of arteries due to the force generated by the contraction of the left ventricle |
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What is the first sound of the heart? |
“lubb” Atriventricular valves and surrounding fluid vibrations as valves close at beginning of ventricular systole |
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What is the second sound of the heart? |
“dupp” Results from closure of aortic and pulmonary semilunar valves at beginning of ventricular diastole, lasts longer |
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What is the third sound of the heart? |
(Occasionally) Caused by turbulent blood flow into ventricles and detected near end of first one-third of diastole |
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How does the heart rate change? |
Nerve messages from the medulla oblongata of the brain |
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What keeps the heart beating at its normal rate? |
Parasympathetic division |
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What causes the heart rate to increase? |
Sympathetic division |
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What are some non-drug things that can increase the heart rate? |
Stress, low blood pressure and high carbon dioxide levels |
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What are some drugs that can increase heart rate? |
Adrenaline, digitalis and caffeine |
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Where is blood pressure monitored? |
Receptors in aorta and the carotid arteries |
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How is immediate pressure change rectified? |
Regulation of the heart beat and relative constriction of the vessels |
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Why might blood pressure immediately change? |
Excitement, stress or blood loss |
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Why might blood pressure increase long term? |
Increased viscosity of the blood or loss of elasticity and/or narrowing the arteries through arteriosclerosis and the more advanced condition of atherosclerosis |
