Two Upper Layers of the Heart
Two lower layers of the heart
wall of each chamber is composed of cardiac muscle tissue
smooth lining of heart chambers
two layed fibrous sac that has lubricated spaced between the two layers
Inner Layer of the Pericardium
visceral pericardium or epicardium
Outer layer of the Pericardium
compression of the heart caused by fluid building up between the visceral pericardium and parietal pericardium
contraction of the heart
relaxation of the heart
Each complete heart beat =
systole and diastole
The purpose of valves
keep blood flowing through the heart; prevent back flow
Examples of Atrioventricular Valves
Tricuspid and Biscuspid (mitral)
Tricuspid valve location
at the opening of the right atrium into the ventricle
Bicuspid valve location
between left atrium into the left ventricle
Examples of Semilunar Valves
Pulmonary semilunar and aortic semilunar
Pulmonary semilunar location
between right ventricle and the pulmonary artery
Aortic Semilunar location
at the behinning of the aorta
leaks, allowing some blood to flow backward into the chamber from which it came
are narrowed than normal, reducing blood flow
Rheumated Heart Disease
cardiac damage resulting from a delayed inflammatory response to streptococcal infection
Mitral valve prolapse
incompetence of mitral valve caused b its edges extending back into the left atrium when the left ventricle contracts
First sound of the heart
Second sound of the heart
caused by the vibration and closure of AV valves during contraction of the ventricles
caused by the closure of the semilunar valves during relaxation of the ventricles
abnormal heart sounds often caused by abnormal valves
The diastole-systole cardiac cycle occurs between
70-80 times per minute (100,000 per day)
How many ounces of blood are pumped with each contraction?
which means 5 quarts per minute
75 gallons an hour and about 2000 gallons a day
Blockage of blood through the coronary arteriescan cause
Myocardial infarction (heart attack)
hardening of the arteries-can totally or partially block coronary blood flow
severe chest pain causes by inadequate oxygen (ischemia) to the heart
how long does angina pectoris last?
15 to 30 mins will resolve with intervention
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