Question

Which one of the following graphs best describe the blood pressure (BP) change when blood moves from the aorta to capillaries?

A) A
B) B
C) C
D) D

Answer 1

Hint: When blood flows through a blood vessel, it exerts a force on the vessel's walls. The blood pressure is measured with a sphygmomanometer, which reads the pressure at the aorta during systole (contraction of the ventricle) and diastole (relaxation of the ventricle).

Complete answer:
The diameter of the blood vessel is inversely related to the change in blood pressure. Blood is less likely to contact the vessel wall in a blood vessel with a big diameter. As a result, there is less friction and resistance. As a result, there is an increase in inflow. More blood contacts the vessel wall in a blood vessel with a narrow diameter. As a result, there is higher resistance to friction.

As a result, there is a decrease in the flow. The aorta's blood pressure is significantly higher than that of the capillaries. This is because, while each individual capillary's diameter is smaller than the aorta, the diameter of a group of capillaries is much larger than the aorta's diameter. As a result, blood pressure in capillaries is lower than in the aorta.

Therefore the correct answer is option 'A’.

Note: Blood pressure differs depending on the type of blood vessel. Because major arteries (such as the aorta) are directly attached to the heart's ventricle, blood pressure is highest there. Blood pressure drops as the blood artery separates from the tiny arteries and into the arterioles. This decrease happens because the surface area to volume ratio has increased, implying that the blood is in contact with greater blood vessel surface area. This lowers the pressure by slowing the velocity of blood within arterioles.