9 Questions
Explain the effects that would occur when receptors on the aortic arch detect a marked increase in blood pressure.
Increased output from cardio inhibitory centre - decrease heart rate. Decrease output from vasomotor centre - vasodilation.
Describe the relative blood flows in the listed arteries when the mean aortic pressure is 90mmHg, mean renal artery pressure is 80mmHg, mean hepatic artery pressure is 90mmHg, and mean subclavian artery pressure is 60mmHg.
Highest flow into subclavian artery, no flow into hepatic artery.
How would the body increase overall blood flow into all arteries in condition A?
Increase cardiac output.
What effects would occur when receptors on the carotid bodies detect a marked decrease in blood pressure?
The feedback to the brainstem would cause decreased output from the cardio inhibitory centre, resulting in an increase in heart rate. Additionally, there would be an increased output from the cardio accelerator centre, leading to an increase in heart rate. Finally, there would be a decrease in output from the vasomotor centre, resulting in vasoconstriction.
How would the body increase overall blood flow into all arteries in condition A?
The body would increase cardiac output to increase overall blood flow into all arteries.
How would the body increase blood flow to the liver but decrease blood flow to the kidneys in condition A?
The body would induce vasoconstriction in renal arteries/arterioles to decrease blood flow to the kidneys, while inducing vasodilation in hepatic arteries/arterioles to increase blood flow to the liver.
What is the effect of increased blood pressure on the heart rate and vasomotor center?
Increased output from cardio inhibitory centre - decrease heart rate, decrease output from vasomotor centre - vasodilation.
What is the effect of decreased blood pressure on the heart rate and vasomotor center?
Decreased output from cardio inhibitory centre - increase heart rate, increased output from cardio accelerator centre - increase heart rate, decrease output from vasomotor centre - vasoconstriction.
How would the body increase overall blood flow into all arteries in condition A?
Increase cardiac output.
Test your knowledge of cardiovascular physiology with this quiz. Learn about the differences between skeletal and cardiac muscle and why the intrinsic conduction system in the heart does not connect to every cardiac myocyte.
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