circulation test pt 2 Flashcards
The structures attached to the atrioventricular valves are called
chordae tendineae.
The main function of the valves in the heart is to
prevent back-flow of blood.
Blood leaves the right ventricle via the
pulmonary trunk.
An irregular heartbeat where contraction of the atria does not always result in contraction of the ventricles, likely indicates a problem with the
AV node.
A condition called tachycardia exists when a person’s heart rate is abnormally high. Which of the following explains how tachycardia may arise?
The sinoatrial (SA) node is receiving increased stimulation.
The atrioventricular (AV) node stimulates the
Purkinje fibers
The coordinating structure responsible for an intrinsic heart beat is the
sinoatrial node
What happens during atrial diastole?
Atria fill with blood.
Use the following information to answer the question.
1. Systole of the ventricles.
2. Opening of the atrio-ventricular valves.
3. Electrical impulse sent from the SA node.
4. Atria fill with blood.
The order in which the events above occur during one heartbeat (the cardiac cycle) is
4, 3, 2, 1
Atria fill with blood.
Electrical impulse sent from the SA node
Opening of the atrio-ventricular valves.
Systole of the ventricles.
The blood vessels that carry blood to and from the head are the
Carotid arteries and jugular veins.
The path followed by blood on one circuit through the heart is
atrium, atrioventricular valve, ventricle, semilunar valve.