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What is the structure that triggers an impulse causing ventricles to contract?
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An electrical signal causes the atria to?
bubble up and popno one knowsthe signal causes the atria to contract.
Why does a dead frogs leg move when electricity is passed through them?
The electrical current triggers an action potential at the neuromuscular junction, causing the muscle cells to depolarize and contract.
What is the pacemaker of the heart that begins the heartbeat?
The SA node begins the heartbeat and is sometimes referred to as the heart's pacemaker. The AV node are where the electrical impulses are delayed for 0.1 second before spreading to both ventricles and causing them to contract.
Is the p wave part of the cardiac cycle?
Yes - On an ECG the P wave is the first wave of the cardiac cycle. It represents the Sinoatrial node which is the natural pacemaker of the heart firing and causing the atria to contract in order to fill the ventricles.
What part of the heart is responsible for causing the rhythmic contraction of the atria and the ventricles?
the sinoatrial (SA) node
When the ventricles relax intraventricular pressure falls and?
blood is pushed against the semilunar valves, causing them to close
What kind of cells in your body can contract?
Muscle cells contract, causing movement and our heartbeat.
Why do hurt?
Due to the presence of lactic acid in your muscles, which triggers pain receptors in that area, causing the feeling of pain
What are the roles of the sino atrial nodes?
the sinoatrial (SA) node is the "pacemaker" of the heart-it is the first stucture that makes up the conduction system of the heart-the system of electrical impulses that are discharged throughout the heart and cause rhythmic cardiac contractions and relaxations. impulse conduction starts in the SA node, causing the atria to contract, then goes to the atrioventricular (AV) node, the bundle of His, and then to the pukinje fibers which cause the ventricles to contract.
What is integrative?
the nervous system responds by sending signals to muscles, causing them to contract, or to glands, causing them to produce secretions
Why do cramps hurt?
Due to the presence of lactic acid in your muscles, which triggers pain receptors in that area, causing the feeling of pain
Is calcium a neurotransmitter?
No, calcium itself is not a neurotransmitter BUT it is highly important in the process of the action potential. The action potential triggers the influx of calcium at the end of the terminal bouton, causing the influx of Ca2+ into the cell and this triggers for the release of the neurotransmitter. :)
