As blood goes from the left ventricle through the arteries and veins of the human body, both its speed and pressure change. The arteries and arterioles can either constrict, reducing the area, or dilate, increasing the area, in response to certain conditions. Both of these changes can affect blood flow and blood pressure. An artery can also develop a permanent narrow area (stenosis) or a permanent wide area (aneurysm). Both of these changes can have significant health consequences. A patient has developed a narrowing of the coronary arteries that provide blood to the heart. If the rate of blood flow through the arteries is to stay the same,A. The length of the arteries must decrease as well.B. The speed of the flow must not change.C. The pressure difference across the arteries must stay the same, requiring a decrease in blood pressure.D. The pressure difference across the arteries must increase, requiring an increase in blood pressure.

As blood goes from the left ventricle through the arteries and veins of the human body, both its speed and pressure change. The arteries and arterioles can either constrict, reducing the area, or dilate, increasing the area, in response to certain conditions. Both of these changes can affect blood flow and blood pressure. An artery can also develop a permanent narrow area (stenosis) or a permanent wide area (aneurysm). Both of these changes can have significant health consequences. A patient has developed a narrowing of the coronary arteries that provide blood to the heart. If the rate of blood flow through the arteries is to stay the same,A. The length of the arteries must decrease as well.B. The speed of the flow must not change.C. The pressure difference across the arteries must stay the same, requiring a decrease in blood pressure.D. The pressure difference across the arteries must increase, requiring an increase in blood pressure.