Chapter 20 Flashcards
The inside lining of the heart in direct contact with blood in the chambers is the…?
Endocardium
Where does blood go from deoxygenated to oxygenated?
Pulmonary Capillaries
For SL valves to close, pressure in the ventricles must be ______ the pressure in the aorta/ Pulmonary trunk…
Less than
Most coronary veins deliver blood directly into the _________.
Coronary sinus
Isovolumetric contraction and Isovolumetric relaxation are phases of the cardiac cycle in which…..?
both SL and AV valves are closed
Which of the following is the inner layer of the heart in contact with blood inside the chambers?
Endocardium
This heart chamber receives oxygenated blood from the pulmonary veins…
Left Atrium
The membrane that surrounds and protects the heart is called the…?
Pericardium
Through which structure does blood pass from the right atrium to the right ventricle ?
Tricuspid valve
Which of the following correctly lists the sequence of structures that a cardiac action potential follows in order to excite contraction of the atria?
-SA node, Depolarization of atria, Contraction of atria
The pacemaker is found where?
Superior wall of the right atrium
Blood traveling in the right coronary artery flows directly into the…?
Marginal and posterior interventricular branches
Which wave in an electrocardiogram represents depolarization of the atria?
P wave
Tendonlike, fibrous cords that connect AV valves are called…?
Chordae Tendinae
This heart chamber receives deoxygenated blood from three systemic veins. It is called????
Right atrium
