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the heart

blood within the pulmonary beins returns to the


blood is carried to capillaries in the myocardium by way of

coronary arteries

The myocardium is the layer of the heart that actually contracts

the structure of the heart wall

the action potential seen in cardiac muscle differs from the action potential of skeletal muscle by

there is a plateau

blood flows passively from the atria to the ventricles through open AV valves when?

during the period of ventricular filling

Gap junctions that allow the cells to contract in a synchronized manner

cardiac muscle has

The av valves are supporeted by chordae tendinae so that they do not blow back up into the atria during ventricular contraction

heart valves

which of the following is not part of the conduction system of the heart

av valve

Noticing the thickness of the ventricle walls helps to

define the left and right side

when the ventricle is in systole

the tricuspid valve is closed

which vessel of the heart receives blood during right ventricular systole

pulmonary trunk

blood enters which of these vessels during ventricular systole

aorta and pulmonary trunk

connects the two atria in the fetal heart

foramen ovale

region in the abdominal cavity

pericardial cavity

small muscle masses attached to the chordae tendineae are the

papillary muscles

the left ventricular wall of the heart is thicker than the right wall in order to

pump blood with greater pressure

the p wave of a normal electrocardiogram indicates

atrial depolarization

the lining of the heart


the outermost layer of serous pericardium

parietal layer

the pacemaker of the heart

SA node

prevents backflow into the ventricles

pulmonary semilunar valves

prevents backflow into the left atrium

mitral valve

prevents backflow into the right atrium

tricuspid valve

prevents backflow into the left ventricle

aortic semilunar valve

network found in the ventricular myocardium

purkinje fibers

heart muscle


serous layer covering the heart muscle


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