Purpose is to prevent back flow of blood thereby assuring unidirectional flow through the heart
Ability of cardiac cells to shorten and cause cardiac muscle contraction in response to an electrical stimulus; can be enhanced by medications such as digitalis, dopamine, and epinephrine
Located between the right atrium and the right ventricle and has three cusps
Located between the left atrium in the left ventricle and has two cusps; also called the bicuspid valve
When a cardiac cell is stimulated and sodium ions rush into the cell and potassium leaks out changing the charge within the cell to positive; results in contraction
Resting state, outside of the cell has a high concentration of positively charged ions while the inside of the cell has a high concentration of negative ions
Right atrium, left atrium, right ventricle, left ventricle
Located between the right ventricle and the pulmonary trunk
Ability of the cardiac pacemaker cells to spontaneously initiate their own electrical impulse without being stimulated from another source
Located between the left ventricle and aorta
Ability of all cardiac cells to receive an electrical stimulus and transmit the stimulus to other cardiac cells
Also referred to as irritability; shared by all cardiac cells; ability to respond to external stimuli; electrical, chemical, and mechanical
Innermost layer of the heart that forms the lining
Down
Hollow muscular organ located in the thoracic cavity between the lungs just behind the sternum
Ions shift back to their original places and the cell recovers the negative charge inside
Outermost layer of the heart
Sac in which the heart is contained
Middle and contractile layer of the heart mad of striated muscle fibers
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