Which of the following conditions would have the greatest effect on peripheral resistance?
A) doubling the viscosity of the blood
B) doubling the length of a vessel
C) doubling the turbulence of the blood
D) doubling the diameter of a vessel
E) doubling the number of white cells in the blood
D) doubling the diameter of a vessel
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Tracheal cartilages provide for _______ on the ________ aspect of the trachea
A. flexibility; anterior B. flexibility; posterior C. rigidity; anterior D. rigidity; posterior
What is the path of blood flow from the heart to the lung tissues and back to the heart?
A. Left ventricle > aorta > brachiocephalic artery > lung tissues > bronchial veins > brachiocephalic vein > superior vena cava > right atrium B. Right ventricle > pulmonary trunk > pulmonary arteries > lung tissues > pulmonary veins > left atrium C. Right ventricle > brachiocephalic arteries > lung tissues > brachiocephalic veins > inferior vena cava > left atrium D. Left ventricle > aorta > bronchial arteries > lung tissues > bronchial veins > azygos vein > superior vena cava > right atrium
Which cardiac chamber has the thickest wall?
What will be an ideal response?
Central chemoreceptors detect a decrease in pH in interstitial fluids in the brain. What is the response of the medulla to maintain delivery of oxygen to cells?
A) A feedback loop is initiated that indirectly increases parasympathetic activity which results in vasodilation and a decrease in blood pressure. B) A feedback loop is initiated that indirectly decreases sympathetic activity which results in vasodilation and a decrease in blood pressure. C) A feedback loop is initiated that indirectly increases parasympathetic activity which results in vasoconstriction and a rise in blood pressure. D) A feedback loop is initiated that indirectly increases sympathetic activity which results in vasoconstriction and a rise in blood pressure.