Term
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Definition
| When the atria contract, we call it ___ |
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Term
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Definition
| When the atria are contracting, the ventricles are ______________. |
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Term
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Definition
| Which valves close during ventricular systole? |
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Term
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Definition
| The AV-valves open during ventricular ___________ |
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Term
rt ventricle--> pulmonary artery
lf ventricle --> aorta |
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Definition
| When the ventricles contract, blood flows into which vessels? |
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Term
AV- valves close;
tri/bicuspid |
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Definition
| The first heart sound occurs when the __________ close. |
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Term
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Definition
| The second heart sound occurs when the _________ valves close |
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Term
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Definition
| An abnormal heart sound is called ____ |
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Term
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Definition
| The atrial heart muscle fibers work together in a group called ____ |
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Term
| Sinoatrial node or SA-node |
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Definition
| What is the heart pacemaker? |
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Term
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Definition
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Term
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Definition
| How many beats/min. does the sa-node normally fire at? |
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Term
| On the floor of the rt. atrium |
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Definition
| Where is the AV-node located? |
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Term
| The signal to the atria is on faster fibers than the signal going to the AV-node |
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Definition
| Why does the AV-node fire after the atria contract? |
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Term
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Definition
| What fibers tell the myocardium of the ventricles to contract? |
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Term
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Definition
| If the AV-node becomes the pacemaker, what will be the heart's rate? |
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Term
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Definition
| If the purkinje fibers were the pacemaker, what would be the heart's rate? |
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Term
| SA-node- atrial synctium- AV-node- AV bundle- purkinje fibers- ventricular syncytium |
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Definition
| List the order of impulse movement through the heart starting with SA-node. |
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Term
| atria contract and then ventricles contract |
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Definition
| One heart cycle includes what events? |
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Term
| atria depolarize and contract |
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Definition
| What occurs during the p-wave? |
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Term
| ventricles depolarize and contract |
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Definition
| What occurs during the QRS wave? |
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Term
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Definition
| What occurs during the T-wave? |
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Term
| electrocardiogram; ECG/EKG |
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Definition
| What is the electrical recording of the heart called? |
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Term
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Definition
| What is a general term for abnormal heart cycles? |
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Term
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Definition
| What is a rapid heart rate called? |
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Term
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Definition
| What is a slow heart rate called? |
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Term
| cardiac center in medulla oblongata |
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Definition
| What controls the pace of the SA-node? |
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Term
| Vagus nerve; cranial nerve X |
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Definition
| What parasympathetic nerve controls the SA-node? |
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Term
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Definition
| Increased parasympathetic stimulation on the vagus nerve will _____ heart rate. |
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Term
| norepinephrine/ adrenalin |
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Definition
| What neurotransmitter is realeased from the sympathetic nerve to stimulate heart muscle? |
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Term
| heat increases it; cold decreases it |
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Definition
| How does temp. affect heart rate? |
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Term
| It hyperpolarizes the nerves, so it is harder to reach threshold. The heart won't beat. |
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Definition
| What does K+ do to the heart? |
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Term
| It causes more forceful contractions, which can be potentially deadly. |
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Definition
| What does calcium, Ca+, do to the heart? |
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Term
| In the aorta and carotid (neck) arteries. |
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Definition
| Where are the baroreceptors that monitor blood pressure located? |
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Term
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Definition
| The baroreceptors in the aorta send info. back to the __________ |
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Term
| the cerebrum and hypothalamus |
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Definition
| What organs have control over the medulla's regulation of the heart cycle? |
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