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Definition
| muscular organ approx. the size of a closed fist. located in the center of the mediastinum, anterior to the spine and posterior to the sternum |
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Definition
| innermost layer of the heart |
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Definition
| thick middle layer of the heart |
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Definition
| protective sac surrounding the heart |
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Definition
| also called the endocardium, in contact with the heart muscle itself |
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Definition
| also called the epicardium, outer fibrous layer |
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Definition
| the space between the pericardial layers that holds approx. 25 ml of straw colored pericardial fluid |
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Definition
| two superior chambers of the heart, walls are much thinner than those of the ventricles |
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Definition
| larger two inferior chambers of the heart |
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Definition
| control flow between the atria and the ventricles |
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Term
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Definition
| the right atrioventricular valve |
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Term
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Definition
| left atrioventricular valve |
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Definition
| control movement of the atrioventricular valves |
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Definition
| connect the atrioventricular valves to the papillary muscles |
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Definition
| control backflow between the ventricles and the arteries into which they empty |
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Definition
| largest artery in the body and has 3 branches: ascending aorta, thoracic aorta, and the abdominal aorta |
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Definition
| arteries that originate in the aorta that supply oxygen rich blood to the myocardium. Has two major branches: anterior descending artery and the circumflex artery. Receive blood during diastole due to backflow from the aorta |
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Term
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Definition
| innermost lining of the arteries and veins |
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Definition
| middle layer consisting of elastic fibers and muscle, much thicker in arteries than veins due to systolic pressure |
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Term
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Definition
| outermost layer of arteries and veins, fibrous tissue covering |
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Definition
| the sequence of events that occurs between the end of one heart contraction to the end of the next |
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Definition
| first phase of the cardiac cycle, relaxation phase |
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Definition
| second phase of the cardiac cycle, contraction cycle |
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Definition
| ventricle ejects about 2/3 of the blood it contains at the end of systole |
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Definition
| the amount of blood ejected during ejection fraction |
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Term
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Definition
| pressure in the filled ventricle at the end of diastole, also called end diastolic volume |
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Term
| Starling's law of the heart |
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Definition
| states that the more the myocardial muscle is stretched, the greater the force of contraction will be |
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Term
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Definition
| the resistance against which the ventricle must contract |
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Definition
| the volume of blood that the heart pumps in one minute |
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Definition
| a network of nerves at the base of the heart |
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Definition
| located in the peripheral blood vessels and are responsible for vasoconstriction |
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Definition
| located in the heart, increase heart rate and contractility |
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Definition
| located in the lungs and peripheral blood vessels, cause bronchodilation and peripheral vasodilation |
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Definition
| 10th cranial nerve that controls parasympathetic stimulation in the heart, slows heart rate |
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Definition
| refers to heart rate, positive-increase and negative-decrease in heart rate |
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Term
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Definition
| refers to the strength of a cardiac muscle contraction |
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Term
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Definition
| refers to the rate of nervous impulse conduction |
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