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Definitions and terms related to the anatomy and function of the heart. Topics include the heart's system, size and location, membranes, wall layers, heart chambers, valves, semilunar valves, chordae tendinea, other features, path of circulation, coronary circulation, cardiac veins, cardiac cycle, conduction system, and ecg. Understand the structure and function of each component of the heart.
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TERM 2
DEFINITION 2
TERM 3
DEFINITION 3
TERM 4
DEFINITION 4
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DEFINITION 5
-atria: upper chambers, receive blood from veins, have auricles: flaps where blood pools -ventricles: lower chambers, force blood out to arteries -left ventricle is thicker & stronger than right because it has to push blood to the whole body -right ventricle only has to go to the lungs -left ventricle is round -right ventricle is pouch shaped & contains the conus arteriosis (funnel leading from the right ventricle to the pulmonary trunk) & modulator band (prevents over extension in right ventricle) TERM 7
DEFINITION 7
TERM 8
DEFINITION 8
TERM 9
DEFINITION 9
TERM 10
DEFINITION 10
-electrical tracking of action potential, takes less than a second -P wave: depolarization of atria, happens right before it contracts - QRS wave: depolarization of ventricles, re-polarization of atria, happens right before it contracts -T wave: ventricular re- polarization - Cardiac output (CO): volume of blood ejected by ventricle each minute, average of 5L/min TERM 17
DEFINITION 17 -Chemical control -norepinephrine & epinephrine: increases heart rate & force of contraction - Ach: decreases the rate & force of contraction -Neural control: senses by baroreceptors & chemoreceptors -cardioacceleratory center in medulla: use sympathetic fibers to release NE to increase heart rate - cardio- inhibitory centers: use parasympathetic fibers to release Ach to decrease heart rate -Autorhythmicity: spontaneous contraction: about 100 beats/min