How Does blood Flows?

Blood Flow In Our Body

As the heart beats, it pumps blood through a system of blood vessels, called the circulatory system. The vessels are elastic tubes that carry blood to every part of the body.

Blood is essential as:

1.It carries oxygen and nutrients to your body's tissues

2.It takes carbon dioxide and waste products away from the tissues.

3.It is needed to sustain life and promote the health of all the body's tissues.

Blood Flow In Heart:

The right and left sides of the heart work together

Right Side

Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium.

Left Side

The pulmonary vein empties oxygen-rich blood, from the lungs into the left atrium.

Atrial contraction

Right Side

Blood flows from your right atrium into your right ventricle through the open tricuspid valve. When the ventricles are full, the tricuspid valve shuts. This prevents blood from flowing backward into the atria while the ventricles contract (squeeze).

Left Side

Blood flows from your left atrium into your left ventricle through the open mitral valve. When the ventricles are full, the mitral valve shuts. This prevents blood from flowing backward into the atria while the ventricles contract (squeeze).

Ventricular contraction

Oxygen and carbon dioxide travels to and from tiny air sacs in the lungs, through the walls of the capillaries, into the blood.

Right Side

Blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs.

Left Side

Blood leaves the heart through the aortic valve, into the aorta and to the body. This pattern is repeated, causing blood to flow continuously to the heart, lungs and body.

Blood flow Throughout The Body:

There are three main types of blood vessels:

The arteries (red) carry oxygen and nutrients away from your heart, to your body's tissues. 

The veins (blue) take oxygen-poor blood back to the heart.

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Arteries:

1.Arteries begin with the aorta, the large artery leaving the heart.

2.They carry oxygen-rich blood away from the heart to all of the body's tissues.

3.They branch several times, becoming smaller and smaller as they carry blood further from the heart.

Capillaries:

1.Capillaries are small, thin blood vessels that connect the arteries and the veins.

2.Their thin walls allow oxygen, nutrients, carbon dioxide and waste products to pass to and from the tissue cells.

Veins:

1.These are blood vessels that take oxygen-poor blood back to the heart.

2.Veins become larger and larger as they get closer to the heart.

3.The superior vena cava is the large vein that brings blood from the head and arms to the heart, and the inferior vena cava brings blood from the abdomen and legs into the heart.

This vast system of blood vessels - arteries, veins, and capillaries - is over 60,000 miles long. That's long enough to go around the world more than twice!

Blood flows continuously through your body's blood vessels. Your heart is the pump that makes it all possible.

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