描述年血液由心流到各種血管,然後回到心期間的血壓轉變.

due to the pumping action of the heart, the blood pressure is increase initially. The blood pressure drops in the small arteries and arterioles due to the decreasing size of lumen offers great frictional resistance to blood flow. Blood flows in pulses in the arteries but flows evenly in capillaries and veins. The large arteries help smooth out the blood flow, so the blood pressure is low. Low blood pressure cause decreasing velocity of blood this allow time for the exchange of materials between blood and tissue cells. From then, the blood pressure is still low from capillaries to vena cava(back to heart).HOPE CAN HELP YOU

動脈回彈、血管SIZE及橫紋肌收縮對BLOOD PRESSURE有影響...