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Combo with AP 208 Heart 2 and 2 others
Terms in this set (52)
Autorhythmic and Contractile cells
Types of Cardiac Cells
Type of cardiac cell that are specialized for initiating and conducting action potentials for contraction. They themselves do not contract. aka pacemaker cells.
This system consists of the Sinoatrial Node, Atrioventricular node, bundle of His, bundle branches & perkinje fibers. It controls the heartbeat.
The ____ node normally exhibits the fastest rate of autorhytmicity at 90-100 action potentials per minute; is aka the natural pacemaker of the heart
This occurs when an abnormally excitable area of the heart initiates a premature action potential; may result in a premature beat or extra systole; the heart races until it returns to normal.
This extends from the SA node within the right atrium to the left atrium
extends from the SA node to the AV node
The impulse rapidly travels down the bundle of His, and throughout the ventricular myocardium via pukinje fibers.
Cardiac Muscle Action Potential
has an RPM close to -90mV(contractile cells)
a process during action potential that causes the Inflow sodium; The membrane potential rapidly becomes reversed to +30mv
the action potential is prolonged near its peak. This occurs because of the activation of "slow" calcium channels; causes inflow of calcium
process during action potential that causes K+ channels to open and K+ diffuses out of the cell. Ca2+ channels are in the process of closing. Returns to -90mV
The difference between skeletal and cardiac muscle action potential: cardiac muscle has a longer refractory period than skeletal muscle.
Indirectly records the electrical activity induced in the body fluids by the cardiac impulse reaching the body surface. Represents the overall spread of activity throughout the heart during depolarization and repolarization.
small upward wave that represents atrial depolarization, about 0.1 seconds after this wave begins, the atria contract.
represents the onset of ventricular depolarization
Indicates ventricular repolarization
Represents the conduction time from the beginning of atrial excitation to the beginning of ventricular excitation. Measured from the beginning of the P wave to the beginning of the QRS complex.
Represents full depolarization of ventricular fibers during the plateau phase.
Time from beginning of ventricular depolarization to ventricle repolarization
Phase of contraction
Phase of relaxation
Average beats per minute
Cardiac cycle lasts
the amount of blood projected per beat; 70 ml
phase of the cardiac cycle where all 4 chambers are in diastole
all 4 valves are closed. the ventricular blood volume does not change
phase of the cardiac cycle just after the AV valves have opened. 70% of the ventricles are filled with blood from the atria. (trap door)
occurs near the end of atrial systole.
period where all 4 valves are closed while the ventricles are contracting
Outer layer of dense connective tissue around the heart. Prevents the heart from overstretching
internal double-layered sac of the pericardium.
composed of Epicardium, Myocardium, and Endocardium
most superficial surface of the heart wall aka visceral pericardium
Middle layer of the heart wall.
inner surface of the heart
Chambers of heart
right atrium, left atrium, right ventricle, left ventricle
the superior chambers of the heart and are less muscular. Arriving chambers of blood.
the inferior, more muscular chambers of the heart. The exit chambers for blood.
the grooves on the surface that accommodate coronary vessels.
The ____ side of the heart pumps blood through the body
pumps oxygenated blood into the aorta
pathway of circulation between the heart and the rest of the body except the lungs
circulation of blood between the heart and the lungs
The _____ side of the heart pumps deoxygenated blood to the lungs
The _______ pumps blood into the pulmonary trunk for pulmonary circulation.
The blood passes through _____ in the lungs where it receives oxygen
At the end of pulmonary circulation, the blood returns to the left side of the heart through ______.
The blood supply that feeds the heart
The first branches of the aorta are the right and left _____.
Make up the coronary sinus
a venous space with no smooth muscle to alter diameter; collects the returned deoxygenated blood, empties into the right atrium.
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