These heart chambers receive blood from the body, then pump it into the ventricles.
What are the atria?
100
All of the valves in the heart are located under what bone?
What is the sternum?
100
Which area of the heart includes the two atria and the area where major vessels enter the heart?
What is the superior border?
100
What is the threshold potential of the heart membranes?
What is -55 to -70 mv?
100
What is another word for the spontaneously depolarizing mass of specialized heart cells in the right atrium?
What is the sinutrial node(SA node)?
200
This wall of tissue separates the atria from the ventricles.
What is the inter-atrial septum?
200
Another name for the right atrioventricular valve is what?
What is the tricuspid?
200
What is the diaphragmatic surface?
What is the area of the heart that the diaphragm rests on?
200
The heart spontaneously reaches threshold in a process called _______.
What is self-excitation?
200
Impulses generated in the SA node pass to which node next?
What is the atrioventricular node(AV node)?
300
The left atrium receives blood from what veins?
What are the pulmonary veins?
300
Another name for the left atrioventricular valve is what?
What is the bicuspid?
300
Which border of the heart includes the left atrium and the left ventricle?
What is the left border?
300
The excitation of cells in the heart leads to the release of what into the cell?
What are positively charged ions?
300
What is the branching bundle of specialized muscle tissue called?
What is the atrioventricular bundle?
400
The right atrium receives blood from what vessels?
What are the superior and inferior vena cava?
400
What is the name of the fibers that are responsible in part for closing the valves?
What are the chordae tendinae?
400
The inferior border is composed of the bottoms of the left and right ventricles. What is another name for this area?
What is the apex?
400
Depolarization in the cells leads to the release of what?
What is calcium?
400
What is the order in which impulses travel from the nodes to the heart?
A. SA node, AV node, Purkinje fibers, AV bundle
B. AV node, AV bundle, SA node, Purkinje
C. SA node, AV node, AV bundle, Purkinje fibers
What is C?
500
Blood exits the right ventricle into what vessel?
What is the Pulmonary trunk?
500
What valve regulates the flow of blood into the aorta?
What is the aortic semilunar valve?
500
The sternocostal surface is comprised of what?
What is the right ventricle and atrium?
500
What is the period of rest between excitations called?