CIRCULATORY 
                               SYSTEM
HOW DOES IT WORK ??
The circulatory system is a system that manage our body's and passes the blood and the nutrients to the vessels and the blood vessels help us to live, because the blood are necesary to the organs and to the heart.

PARTS:
There are someone of parts of the circulatory system
1- Aorta. 2- Pulmonary arteries. 3- Descending aorta. 4- Femoral artery.
5- Superior vena cava. 6- Pulmonary veins. 7- Inferior vena cava. 8- Femoral vein. 9- Veins. 10- Arteries and capillares.

VEINS:
Veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from tissues back to the heart.

VARICOSE AND SPIDER VEINS:
The varicose and spider veins are swollen, twisted veins that usually appear on the legs, but also can form in other parts of the body.

EXAMPLES OF THE VARICOSE VEINS:
1-Hemorroids
2-Varicles

WHY ARE THEY FORMED??
Varicose veins form because the valves in the veins that should prevent blood from flowing backwards are not working as they should.the increased amount of blood in the vein pushes against the vein walls, and the vein gets bigger.

TYPES OF VEINS:
Arteries, Capillares ,Varicose and Spider.

ARTERIES:
Arteries carry oxigen-rich blood away from the heart to all of the body's tissues. They branch several times, becoming smaller and smaller as they carry blood farter from the heart and into organs.

CAPILLARES:
These are small, thin blood vessels that conect yhe arteries and the veins. Their thin walls allow oxigen, nutrients, carbon dioxide, and other waste products pass to and from cells.

ILLNESES OF THE CIRCULATORY STSTEM:
There are no symptoms with high blood pressure, wich is why it's often called
''THE SILENT KILLER''.
ATHEROSCLEROSIS:
Also kown as hardening of the arteries, occurs when plaque builds up on the walls of your arteries and evetually bloks of flow.Plaque is made of choresterol, fat, and calcium.
CORONARY ARTERY DISEASE:
Indicates that the plaque buildup in your arteries has caused the arteries to narrow and harden. Blood clots can further blook the arteries.

WHAT HAPPENS WHEN A VEIN BECOMES OBSTRUCTED ??
Of the vascular diseases the most common is atherosclerosis, that is, fat caps that obstruct the veins and arteries, mainly the arteries, because they handle a high pressure blood flow and are more seriously affected. That is when there is a loss of blood flow to the organs.
Over the years, we can all acumulate a little fat in the arteries. However, when there is significant deficit of oxigen.
There are circumstances of risk that can cause the arteries to be in this way:
high blood pressure, high blood choresterol levels, smoking, diabetes, obesity, stress, sedentary livestyle, as well as hereditary factors.










WHAT HAPPENS WHEN A CHILDREN SUCK THEIR ARMS AND THEV GET PURPLE AND RED??
What happens is that the blood acumulates in the plie of the suking and pick a little of color, usually lats at most a week and oftenhappens to children aged two to four years.

IN THE VENTRICULAR SYSTOLE, VALVES ATRIO-VENTRICULAR CELLS ARE CLOSED, WHERE DOES THE BLOOD COME FROM??
For the pulmonary arteries and the aorta.

WHAT ARE THE CAVITIES OF THE HEART??
Ventricle left and right, atrium left and right.

WHAT HAPPENS DURING DIASTOLE??
The heart dilates and fills with blood.

WHAT IS THE MAJOR CIRCULATION??
Is the one that goes from the right ventricle to the left atrium.