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34 Cards in this Set

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The heart is enclosed within an area of the thorax known as
Mediastinum
The double sac membrane that cover the heart is the
Pericardium
The heart has three layers of tissue; the middle and thickest layer is called
Myocardium
The layer of the heart tissue lining the heart chambers and covering valve tissue is the
endocardium
The heart chambers are seperated longitudinally by a body of tissue known as the
cardiac septum
The blood recieving chamber of the heart are the
atria
The flat, wrinkled appendage of the atruim, which increases its capacity is the
auricle
The vena cava enter the right atrium along with a third vein known as
Coronary Sinus
The pumping chamber of the heart are the
ventricles
Blood returns to the heart from the lungs by means of the
Pulmonary Veins
The large artery carrying blood to the body from the left ventricle of the heart is the
aorta
Those blood vessels that carry blood away from the heart are
arteries
Those blood vessels that carry blood toward the heart are
veins
On the right side of the heart, the valve between the right atrium and right ventricle
tricuspid valve
On the left side of the heart, the bicuspid valve has two flaps and is also known as the
mitrial valve
The valves leading toward the pulmonary trunk and aorta are referred to as the
semilunar valves
Arteries suppling blood to the tissue of the heart are the
coronary arteries
Cardiac muscle cells are connected to one another by junctions called
intercalculated discs
The 1st heart sound of the heart means the
closure of AV valves (shuts)--and ventricular contraction (systole)
The 2nd sound of the heart means
The closing of the Semilunar Valves and relaxation (diastole)
This device records the electreical activities associated with the contraction and relaxation of the heart, measured by placement of electrodes on the body surface
Electrocardiogram (EKG)
Atrial Depolarization; signals atrial systole
P wave (EKG)
Ventricular depolarization ; signals onset of the ventricular systole
QRS wave (EKG)
Ventricular repolarization ; precedes ventricular diastole
T wave (EKG)
Heart contractions are known by the alternate term
systole
relaxation periods of the heart when contractions are not occuring is
diastole
The smallest vessels, which carry bood toward to the cells of the tissues are the
capillaries
The semilunar valves prevent blood from flowing backwards into
The ventricles
Most of the cardic muscles of the heart is found in
myocardium
cardic muscle has specialized cells known as
nodal cells
transmits action potentials to the top of interventricular septum
bundle fo HIS
conducts action potential to ventricular muscle cells ; stimulates contraction of cardiac muscle cells as a unit
Purkinje Fibers; AKA bundle of HIS
supplied by VAGUS nerve;
releases ACETYCHOLINE
Inhibitory effect on the heart;
decreases heart rate
decreases force of contraction
Parasympathetic stimulation
Supplied by cardic nerves;
Releases Norepinephrine
stimulatory effect on heart;
increases heart rate;
increases force of contraction
Sympathetic division