11.09.06
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- Can the heart beat without any kind of neurological or hormonal influence:?
- Yes
- Heart muscle has a ? beat.
- Intrinsic beat
- What does intrinsic mean?
- The heart can beat all on it own
- How long can a human heart beat once it is removed from the body?
- 4-6 hrs
- What is the name of the specialized cells in the heart tissue that can cause contraction?
- Sinoatrial node aka SA node and the atrial ventricular node aka AV node
- Where is the SA node located?
- In the right atria
- Where is the AV node located?
- In the right atria
- What does the SA node and he AV node do?
- They spark a contraction in the heart
- Skeletal and cardiac muscles are very similar what is the difference?
- Skeletal muscal cells have no communication, cardiac cell can communicate.
- After the K+ has crossed the length of the heart, what does it do next?
- It move downward in the gap junctions, in the atrial
- When the K+ moves downward in the gap junctions does it move at the same time?
- Yes
- When does the K+ stop after it has moved downward in the gap junctions in the heart?
- When it reaches the bottom of the atria
- ***Does the ventricals have gap junctions?
- No, Only the one that is connected to the SA node goes down between the ventricals
- What is the area called when there are no more gap junctions?
- Atrioventricular septum.
- What protien tube is between the cardiac muscle cell that allow communication?
- Gap junction aka connetion
- The intrinsic cells are what?
- SA nodes AV nodes
- What does the SA node cells act like to spark action potentials?
- Acytocholine
- What is been repelled through the gap junctions?
- K+
- What is the particular order that K+ goes in across the heart?
- From the right atria to the left atria