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Anastomosis
Communication between two or more vessels
Cardiac Cycle
The period of time from the end of one cardiac contraction to the end of the next
Diastole
The period of time when the myocardium is relaxed and cardiac filling and coronary perfusion occur
Systole
The period of the cardiac cycle when the myocardium is contracting
Chronotropy
Pertaining to heart rate
Inotropy
Pertaining to cardiac contractile force
Dromotropy
Pertaining to the speed of impulse transmission
Intercalated Discs
Specialized bands of tissue inserted between myocardial cells that increase the rate in which the action potential is spread from cell to cell.
sycnytium
Group of cardiac muscles that physiologically function as a unit
Cardiac depolorization
A reversal of charges at a cell membrane so that in inside of the cell become positive in relation to the outside; the opposite of the cells resting state in which the inside of the cell is negative in relation to the outside
Resting potential
The normal electrical state of cardiac cells
Action potential
The stimulation of myocardial cells as evidenced by a change in the membrane electrical charge that subsequently spreads across the myocardium.
Repolarization
The return of the cell to its preexictation resting state
Excitibility
ability of the cell to respond to an electrical stimulus
Conductivity
Ability of the cell to propagate the electrical impulse from one cell to another
Automaticity
Pacemaker cells capability of self depolarization
Contractility
ability of muscle cells to contract or shorten
Poiseuille's law
a law of physiology stating that blood flow through a vessel is directly proportional to the radius of the vessel to the 4th power
Perfusion
the supplying of 02 and nutrients and body tissues as the result of the constant passage of blood through capillaries
Hypoperfusion
inadequate profusion of the body tissues, also called shock
Ejection Fraction
ratio of blood pumped from the ventrical to the amount remaining at the end of diastole
Stroke volume
the amount of blood ejected by the heart in one cardiac contraction
Preload
the pressure within the ventricles at the end of diastole, commonly called the end diastolic volume
Cardiac contractile force
force of the strength of a contraction of the heart
Starling's law of the heart
law of physiology stating that the more the myocardium is stretched up to a certain limit, the more forceful the subsequent contraction will be
Afterload
the resistance against which the heart must pump
Cardiac output
the amount of blood pumped by the heart in one minute
blood pressure
the tension exerted by blood against the arterial walls
Peripheral vascular resistance
the resistance of the vessel to the flow of blood increased when the vessels constrict, decrease when the vessels dilate
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