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Ch. 13 Review Q

Physiology 2420

QuestionAnswer
The second heart sound is produced as a result of... Blood rushing through the pulmonary valve as it is closing and blood rushing through the aortic valve as it is closing.
During the PQ segment of an ECG, what occurs in the heart? AV nodal delay
In the conduction system of the heart, after the impulse has passed thought the AV node, where does the impulse travel to next? Atrioventricular bundle
Before blood enters the right atrium, where does it travel through? Vena Cavae
Which of the following contains oxygenated blood? 1. The right ventricle 2. The left ventricle 3. The pulmonary artery 4. The right atrium 5. The left atrium the left ventricle and the left atrium
What segment of the ECG is associated with the contraction of your heart's left ventricle? R wave
Blood from the systematic circuit returns directly to what? right atrium
In the pacemaker or autorhythmic cells in the heart, the first channels to open during an action potential are the _____________. funny channels
The rapid depolarization phase of an action potential in autorhythmic cells in the heart is due to the opening of Ca channels
In contractile cells of the heart, the action potential has a rapid depolarization phase caused by the movement of what ion into the cell? Na
The plateau phase of the contractile cell action potential in the heart is caused by the movement of which ions? K, Ca
Which of the following is responsible for ventricular repolarization in an ECG? T wave
Which of the following is a vein that contains oxygenated blood? pulmonary
In excitation-contraction coupling in cardiac muscle, calcium channels are located in the ___________ and _____________. plasma membrane, SR
Keeping blood in different chambers of the heart from mixing is a function of what structure? septum
What is the function of the sodium-calcium exchanger in cardiac muscle? remove calcium from the cytosol by transporting it the the extracellular fluid.
In the conduction system of the heart, where does the impulse travel right after it passes through the AV bundle? left and right bundle branches
Which interval is an estimate of conduction though the AV node in an ECG? PQ segment
When an impulse begins in the SA node in the conduction system of the heart, it travels next through two pathways. What are these two pathways called? internodal pathway and interatrial pathway
What causes the second heart sound in a heart beat? semilunar valves
How does the current spread from cell to cell in cardiac muscle? gap junctions
What are the three ways calcium is removed from the cytosol in cardiac muscle? Ca2+ ATPase in SR, Ca2+ ATPase in plasma membrane, Na+/Ca2+ exchanger in plasma membrane
What is the pacemaker of the heart? SA node
The depolarization of the action potential in the pacemaker cells is driven by the rapid influx of calcium ions through ______________ channels. L-type
Created by: GracieLou
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