20 Questions
What is the main factor influencing Stroke Volume?
Mechanical factors
Which nerve is responsible for inhibiting heart rate by releasing acetylcholine?
Vagus nerve
What is the primary cause of abnormal S4 heart sounds?
Weak left ventricle
Which reflex helps oppose changes in pressure by adjusting heart rate?
Aortic Reflex
What is the main determinant of Preload in the heart?
Volume of each ventricle during diastole
Which factor does NOT affect Cardiac Output calculation?
Blood Pressure
What might happen if PVR increases significantly in terms of Stroke Volume?
Stroke Volume would decrease
Which type of reflex helps stimulate the vasomotor center when blood distribution changes?
Vasomotor Pressoreflexes
What does Chronotropy refer to?
Heart rate
What primarily affects Venous Return to the heart?
Total blood volume
Which part of the heart receives deoxygenated blood from the inferior and superior vena cava as well as the coronary sinus?
Right Atrium
Which layer of the heart consists of branching cells connected by intercalated discs?
Myocardium
What is the function of the Purkinje fibers in the heart's conduction system?
Conduct impulses to the ventricles
What causes the 'S1' heart sound, which is described as longer and lower than 'S2'?
Contraction of ventricles and closure of AV valves
What is the primary function of the atrioventricular (AV) node in the cardiac conduction system?
Conduct impulses slower to allow for atrial contraction
Which vessels supply most of the right ventricle with blood in the heart tissue?
Right Coronary Artery
During which phase of the cardiac cycle do the atria relax and begin refilling with blood?
Isovolumetric Ventricular Relaxation
'Atrial kick' accounts for approximately what percentage of blood volume in the atria during atrial systole?
~20%
'Lubb-dupp' refers to which sounds made during the cardiac cycle?
'S1' and 'S2'
What is the function of the semilunar valves in the heart?
Located at bases of large vessels attached to ventricles, grow as pressure increases with contraction
Explore the fundamental components of the cardiovascular system including the heart, blood vessels, and blood circulation. Learn about the structure and function of the heart as a muscular pump that facilitates blood circulation throughout the body.
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