18. Cardiovascular System: the Heart

Timing and events of the cardiac cycle

Heart Physiology: Mechanical Events

The Cardiac Cycle

 Angina pectoris is not associated with specific heart sounds or murmurs. An incompetent cardiac valve produces a swishing sound on auscultation. 

 Cardiac tamponade often muffles cardiac sound so that no heart sounds can be heard. An incompetent cardiac valve produces a swishing sound on auscultation. 

 Many types of altered heart sounds can be associated with a myocardial infarction, but none are specific. An incompetent cardiac valve produces a swishing sound on auscultation. 

 A doctor puts his stethoscope on a patient's chest over the location of the heart and hears an abnormal swishing sound. Which of the following conditions is the best diagnosis for the patient's condition? 

Cardiac Cycle : volume changes

Cardiac Cycle - pressure changes

 The first heart sound (the the “lup” of “lub-dup”) is generated by the closure of the atrioventricular valves. The second heart sound (the “dup”  sound) is caused by closure of the semilunar valves.  

 The second heart sound (the “dup” of “lub-dup”) is caused by the __________. 

Smart Art Video: Cardiac Cycle

Heart Sounds | S1 S2 S3 S4 

Heart Sounds and Heart Murmurs

Auscultating Heart Sounds

Cardiac Cycle

 the changes in blood volume in all chambers of the heart 

 The cardiac cycle refers to the mechanical events occurring during one heartbeat. 

 the number of times the heart beats in one minute 

 the changes in pressure gradients in all chambers of the heart 

 the movement of impulse from the SA node to all regions of the heart wall 

 the closing and opening of the heart valves during each heartbeat 

 The cardiac cycle includes all of the following events EXCEPT __________. 

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