Heart
Contains actin and myosin
Is the heart muscle
Is found in the ventricles but not he atria
Pumps the blood
Speed up the action potential as it moves through the conduction system
Prevent the backflow of blood from the ventricles to the atria
Enhance drainage of the coronary veins
Push blood into the venae cavae
Called S1
Due to the closure of the AV valves
Occurs at the beginning of ventricular contraction
Caused by the firing of the SA node
Due to the closure of the semilunar valves at the beginning of ventricular relaxation
Lubb
The heart sound caused the contraction of the ventricular myocardium
Caused by the firing of the SA node
To the systemic circulation
Into the aorta
To the lungs for oxygenation
To the venae cavae
All carry oxygenated blood
All carry unoxygenated blood
All are colored red
All are called great vessels
Venae cavae
Pulmonary artery
Aorta
Pulmonary capillary
Thoracic cavity
Ventral cavity
Pleural cavity
Mediastinum
Are outflow valves
Are anchored by chordae tendineae
"see" only oxygenated blood
"see" only unoxygenated blood
Called a pacemaker cell
Referred to as being ectopic
A stem cell
Found only in heart valves
Lies primarily to the right of the sternum
Only beats in response to stimulation by autonomic nerves
Is located within the mediastinum
Lies vertically and parallel to the midsternal line
Mitral
Tricuspid
Pulmonic
Aortic
In a healthy heart, coronary blood flow can increase
Atherosclerotic coronary blood vessels are usually maximally dilated at rest
A decrease in coronary blood flow causes pain (called angina)
All of the above are true
Pumps blood into the aorta
Receives blood from the left atrium
Contains oxygenated blood
The oxygen from blood within the left ventricle diffuses across the endocardium into the left ventricular myocardium
Is called pericardial effusion
Compresses the heart externally
Impairs myocardial contraction
All of the above are true
Base and apex of the heart
Semilunar valves
AV valves
SA node and AV nodes
That the heart must work harder than normal
That there is inadequate coronary blood flow
A stenotic mitral valve
Chronic anemia
Are attached to chordae tendineae
Are semilunar valves
"see" oxygenated blood
"see" unoxygenated blood
Systole and diastole
Filling and ejecting
Depolarization and repolarization
P wave and T wave
Rising ventricular pressure during ventricular contraction
Rising atrial pressure
Rising pressure in the pulmonary artery and aorta
Increasing oxygen saturation of the hemoglobin