MICROANATOMY

Detailed explanation-1: -Like all fluids, blood flows from a high pressure area to a region with lower pressure. Blood flows in the same direction as the decreasing pressure gradient: arteries to capillaries to veins. The rate, or velocity, of blood flow varies inversely with the total cross-sectional area of the blood vessels.

Detailed explanation-2: -Blood pressure decreases as arteries transform into capillaries to prevent damaging the delicate structure of capillaries, as well as allow for time for this exchange to occur. Blood in capillaries then flow into venules, which eventually turn into veins, returning the blood to the heart.

Detailed explanation-3: -Vasodilation is the medical term for when blood vessels in your body widen, allowing more blood to flow through them and lowering your blood pressure. This process happens normally in your body without you realizing it.

Detailed explanation-4: -Each time the heart beats (contracts and relaxes), pressure is created inside the arteries. The pressure is greatest when blood is pumped out of the heart into the arteries. When the heart relaxes between beats (blood is not moving out of the heart), the pressure falls in the arteries.

Detailed explanation-5: -The venous side of the circulation is a low-pressure system compared with the arterial side. Pressure within the named veins is usually between 8 and 10 mmHg, and CVP is  0–6 mmHg (3, 9).