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19 Cards in this Set
- Front
- Back
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Can the heart beat without any kind of neurological or hormonal influence:?
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Yes
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Heart muscle has a ? beat.
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Intrinsic beat
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What does intrinsic mean?
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The heart can beat all on it own
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How long can a human heart beat once it is removed from the body?
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4-6 hrs
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What is the name of the specialized cells in the heart tissue that can cause contraction?
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Sinoatrial node aka SA node and the atrial ventricular node aka AV node
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Where is the SA node located?
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In the right atria
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Where is the AV node located?
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In the right atria
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What does the SA node and he AV node do?
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They spark a contraction in the heart
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Skeletal and cardiac muscles are very similar what is the difference?
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Skeletal muscal cells have no communication, cardiac cell can communicate.
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After the K+ has crossed the length of the heart, what does it do next?
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It move downward in the gap junctions, in the atrial
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When the K+ moves downward in the gap junctions does it move at the same time?
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Yes
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When does the K+ stop after it has moved downward in the gap junctions in the heart?
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When it reaches the bottom of the atria
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***Does the ventricals have gap junctions?
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No, Only the one that is connected to the SA node goes down between the ventricals
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What is the area called when there are no more gap junctions?
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Atrioventricular septum.
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What protien tube is between the cardiac muscle cell that allow communication?
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Gap junction aka connetion
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The intrinsic cells are what?
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SA nodes AV nodes
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What does the SA node cells act like to spark action potentials?
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Acytocholine
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What is been repelled through the gap junctions?
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K+
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What is the particular order that K+ goes in across the heart?
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From the right atria to the left atria
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