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19 terms

BMS 333 Chapter 46

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Small pulmonary arteries are ______
Muscular (cows and pigs are thickest, dog and sheep are the least)
Alveolar Vessels
Surround Alveoli
Are effected by pressure in the alveolus (coughing, straining, etc...)
Extra-Alveolar Vessels
Not effected by pressure in the alveolus
Effected by pressure in the vascular bundles
T/F Vascular resistance is much lower in the pulmonary circulation
True-Not as many areas to provide resistance
(R) Resistance =
Change in pressure/ Flow(cardiac output)
Most of the resistance in pulmonary circulation is found in the ____
Capillary Bed
Quardripeds have a ___-___ preferential blood distribution
dorsal-caudal
Sympathetic nervous system (epinephron and norepinephron) vaso_______
Vasoconstricts
Parasympathetic nervous system (nitric oxide/acetylcholine) vaso_____
Dilates
Histamine release causes vaso_____
Constriction
Sildenaphil promotes vaso____
Dilation
Lung Hypoxia leads to
Vasoconstriction in the areas where the lung is hypoxic so that blood goes to the well ventilated areas
Vasoconstriction as a result of hypoxia could lead to Pulmonary ______
Hypertension which can lead to right side of the heart failure
Brisket Disease
Happens when cattle go to high altitude
Hypoxia leads to vasodilation leads to hypertension leads to heart failure leads to edema (Mechanism for vasodilation unknown-not pulmonary innervation)
Excersize induced pulmonary hemorrhage
Cardiac Output increases-Vessels Vasodilate to make up for extra blood flow
Vessels cannot compensate enough so they hemorrhage
Extra pulmonary structures drain into the ___ vein
Azygous
Intrapulmonary structures at the capillary level drain into the _____vein
Pulmonary
T/F Inspiration increases venous return and right ventricular filling
True
Exhalation decreases venous return to the _____ and fills _____
Right Atrium and the left atrium is filled by pulmonary veins