Chapter 2: Cardiovascular System Flashcards
Action Potential
a rapid sequence of changes in the voltage across a membrane
AV Node
electrical relay Station between the upper and lower Chambers of the heart.
Atrium
one of the 2 upper Chambers in the heart that recieves blood from the circulatory System
Automaticity
the property of Cardiac cells to generate Spontaneous action potientals
Bachmann’s Bundle
a musclar bundle composed of parallel muscle Strands connecting the left & right atria & serving as the primary electrical connection between lert and right atria
Bundle Branches
Offshoots of the bundle of His in the hearts ventricles.
Bundle of His (AV bundle)
an elongated segment connecting the AV node and Left and right bundle branches of septal crest
Complexes
atrial or ventricular contractions as they appear on ECG; complete ECG wave forms.
Conductivity
the capicity of a compound to convey energy like Skin, thermal, or electrical conduction.
Contractility
the ability of the heart to eject a Stroke volume at a given arterial pressure and preload
coronary Circulation
the movement of blood throughout the vessels that supply the myocardium (heart muscle).
Depolarization
when change occurs within a Cell that causes the distribution of electric charges to alter leaving the cell with a less negative charge than the outside
Diastole
when the heart muscle relaxes and the Filling or chambers with blood.
Excitability
allowing the cell to respond to Stimulation by rapid changes in membrane potential produced by ion fluxes across the plasma membrane
Interval
The period of time between two activites within the heart.
Ischemia
a condition in which blood flow is restricted or reduced in a part of the body.
Isoelectric
relating to or being a Flatline on an electrophalogram lndicating a lack of electrical brain activity.
Parasympathic
a network of nerves that relaxes your body arter periods or stress or danger.
Pericardium
a membrane, or sac the surrounds your heart.
Polarization
a membrane that has a positive electrical charge on one side and negative on another side.
Purkinje Fibers
Specialized conducting fibers composed of electrically excitable cells.
Purkinje Network
a crucial component in electrical excitation of human heart