Term
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Definition
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Term
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Definition
| separates the RA from the RV |
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Term
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Definition
| separates the LA from the LV |
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Term
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Definition
| backflow of blood into the atria |
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Term
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Definition
semilunar valve
separates the right ventricle from the pulmonary artery |
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Term
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Definition
semilunar valve
separates the left ventricle from the aorta |
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Term
| Mean arterial pressure (MAP) |
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Definition
| the arterial pressure necessary to prefuse blood to major body organs such as the kidneys and the brain |
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Term
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Definition
normally about two thirds of the cardiac cycle
consists of relaxation and filling of the atria and ventriles |
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Term
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Definition
| consists of the contraction and emptying of the atria and ventricles |
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Term
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Definition
| the basic contractile unit of the myocardial cell |
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Term
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Definition
the amount of blood pumped from the left venticle each minute
depends on the relationship between heart rate and stroke volume (product of these two variables) |
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Term
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Definition
| can be determined by dividing the CO by body surface area |
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Term
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Definition
| the number of times the ventricles contract each minute |
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Term
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Definition
the amount of blood ejected by the left ventricle during each contraction
variables include HR, preload, afterload, and contractility |
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Term
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Definition
- refers to the degree of myocardial fiber stretch at the end of diastole and just before contraction
- determined by the amount of blood returning to the heart from both the venous system (right heart) and the pulmonary system (left heart)
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Term
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Definition
| the pressure or resistance that the ventricles must overcome to eject blood through the semilunar valves and into the peripheral blood vessels. |
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Term
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Definition
peripheral component of afterload
the pressure that the heart must overcome to open the aortic valve |
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Term
| Systemic vascular resistance |
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Definition
| a combination of blood viscosity (thickness) and arteriolar constriction |
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Term
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Definition
| affects stroke volume and CO and is the force of cardiac contraction independent of preload |
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Term
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Definition
the amount of pressure/force generated by the LV to distribute blood into the aorta with each contraction of the heart
it is a measure of how effectively the heart pumps and is an indicator of vascular tone |
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Term
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Definition
| the amount of pressure/force against the arterial walls during the relaxation phase of the heart |
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Term
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Definition
in the arch of the aorta and at the origin of the internal carotid arteries
stimulated when the arterial walls are stretched by an increased BP |
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Term
| Peripheral chemoreceptors |
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Definition
sensitive primarily to hypoxemia.
when stimulated, these chemoreceptors send impulses along the vagus nerves to activate a vasoconstrictor response and raise BP |
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