# data[].attributes.body
Similar to arteries.

Has 3 walls

Middle wall is made up of muscle tissue.

The walls of veins are generally thinner than those of arteries

# data[].attributes.body
They are only one cell thick, which makes it easy for diffusion to happen.

# data[].attributes.body
Structure- the walls are very thick

Has three layers

Innermost layer- epithelial cells, which are very smooth. This helps the blood to flow freely.

Middle layer- mostly muscle tissue.

Outermost layer- flexible connective tissue.

# data[].attributes.body
They carry the blood back to the heart so the cycle can repeat and blood can go around your body again.

# data[].attributes.body
These are the blood vessels that carry the oxygen rich blood out of the heart. Some arteries branch out of the aorta, the first branches called the coronary arteries carry blood to the heart itself. The arteries also control blood pressure. This happens when you are running. If your running your muscle cells need more oxygen- which the blood is carrying. To make sure that this happens the vessels near the muscles will relax and open up. Since the stomach, for example. doesn’t need as much oxygen at that moment their vessels contract.

# data[].attributes.body
Since the walls are so thin, diffusion can happen through them. oxygen and glucose are exchanged from the cells to the blood through the wall of the capillary. Capillaries also connect arteries and veins.

# data[].attributes.body
As you can tell the structures of veins and arteries are very similar.

# data[].attributes.headline
3 factors that assist the flow of blood in the veins

# data[].attributes.subject
3 factors that assist the flow of blood in the veins

# data[].attributes.body
1. They are near skeletal muscles and the contraction of the muscles help to push the blood through the veins.
2. When you breathe it squeezes pressure against the veins and pushes the blood more.
3. Larger veins in your body have valves that prevent blood from flowing backwards.

# data[].attributes.body
How strong the blood is pushing against the artery walls.

# data[].attributes.body
It's checked with a sphygmomanometer

# data[].attributes.body
High blood pressure has a lot of names- the silent killer, and hypertension.

# data[].attributes.body
As a fraction- ventricles contracting over ventricles relaxing