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Small pulmonary arteries are ______
Muscular (cows and pigs are thickest, dog and sheep are the least)
Are effected by pressure in the alveolus (coughing, straining, etc...)
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
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
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
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