List and describe the order in which an “electrical” signal spreads through the
ID: 3509799 • Letter: L
Question
List and describe the order in which an “electrical” signal spreads through the heart’s conduction system, including naming all the components and describing their function regarding stimulating contraction. Also, describe the direction contraction occurs and the way blood flows with these contractions.
Does the brain send a signal to start each heartbeat? What do signals from the brain do to the heartbeat?
What is the name and location of the internal pacemaker in the heart?
How does this pacemaker send its signal to contract? Through what structures?
How far does this signal move (through what part[s] of the heart)?
Which way does the signal to contract move? Where does the signal stop?
Which way does the blood move?
What structure blocks the signal from progressing?
What structure “organizes” the blocked signal and passes it through the blocking structure? Where is the “organizing” structure found?
The newly organized signal pass down what structure that divides into the ____ and ____ bundle branches. Where are these bundle branches found?
What does the signal down the bundle branches tell the ventricles to do?
What is the tip of the heart called?
When the reorganized signal is near the tip of the heart, a branch called the ________ band carries the signal to the _______ muscles, which contract and pull on the ________ __________. Tension on the “strings” hold the ________ ____________ in place and do not let them prolapse into the atria. The strings do NOT close the ______.
Since the signal is now at the tip of the heart, where does the signal go then? What structures carry the signal after the signal has reached the tip of the heart? Where are these structures found?
As the signal moves along these new structures, which way does the signal move? What does this signal cause the ventricles to do?
Which direction is the contraction occurring in the ventricles?
Which way is blood flowing? Toward which area of the heart? Into which two structures?
Explanation / Answer
The stimulating signals starts in SA node and SA node sends signal to atria to contract.
Then signal travels to AV node to bundle of his to contract ventricle.
When atria contracts blood flows to ventricle and when ventricle contracts blood flows to all over body via aorta except lungs.
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