What is the Frank Starling law of the heart?
Why should the contraction and excitation of each heart chamber be coordinated?
Which side of the heart should contract first?
Does a syringe travel through body fluids?
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What wave reflects the depolarization of the atria?
The P wave reflects the depolarization of the atria.
What is the first sound of the heart?
The first heart sound (the "lub" of the "lub-dup") is generated by the closure of the atrioventricular valves.
How to calculate SV?
The SV is calculated by subtracting the ESV from the EDV. You are comparing the volume of the ventricle at its fullest to its emptiest.
Which node initiates heart contraction?
The sinoatrial node, by spontaneously depolarizing faster than the atrioventricular node, initiates heart contraction.
Which ventricle empties into the pulmonary circuit?
The left ventricle empties into the pulmonary circuit.
How long does a muscle cell last?
the muscle cell is ready to respond to a threshold stimulus. a cardiac muscle cannot respond to any stimulus and lasts only 1 to 2 milliseconds. a skeletal muscle cannot respond to any stimulus and lasts about 250 milliseconds. the muscle cell is not in a position to respond to a stimulus of any strength.
Where does the impulse originate from in the heart?
SA node, AV node, bundle of His, bundle branches, and Purkinje fibers. The impulses of the heart originate at the SA node (pacemaker). The impulse is then transmitted to the AV node (atrioventricular node), where the impulse slows down to allow the atria to completely contract and thereby fill the adjacent ventricles.
What is the Frank Starling law of the heart?
According to the Frank-Starling law of the heart, a. shortening cardiac muscle fibers prior to contraction causes more forceful contractions. b. increasing venous return increases EDV, which leads to an increased stroke volume. c. as cardiac output decreases, blood pools in the vasculature and increases arterial blood pressure.
Why should the contraction and excitation of each heart chamber be coordinated?
a. Excitation and contraction of each heart chamber should be coordinated to ensure efficient pumping.
Which side of the heart should contract first?
c. The right side of the heart should contract first to ensure that oxygenated blood is delivered to the heart before the left side contracts.
Does a syringe travel through body fluids?
d. It does not travel through body fluids.