EKG Basics Flashcards
____ cells contain contractile filaments. When these cells are electrically stimulated, the filaments slide together and the myocardial cell contracts.
Myocardial
____ cells are specialized cells of the electrical conduction system responsible for the spontaneous generation and conduction of electrical impulses.
Pacemaker
Refractory is ____ than contraction
Longer
____-response occurs in the cells of the atria, ventricles and purkinje fibers because they contain ____ channels for Na+
Fast
____-response action potentials are in the SA and AV nodes because they contain ____ channels for Ca++ and Na+
Slow
What is automaticity?
Heart cells can generate an impulse without being stimulated
What is excitability?
It refers to the ability of cardiac muscle cells to respond to an outside stimulus.
What is conductivity.
It refers to the ability of a cardiac cell to receive an electrical impulse and conduct it to an adjoining cell.
What is contractility?
It refers to the ability of myocardial cells to shorten in response to an impulse resulting in a contraction.
