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Systemic circulation

 
Systemic Circulation

 
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Systemic circulation
 
 
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Systemic circulation is the portion of the cardiovascular system which carries oxygen
Oxygen

Oxygen no O2 produced; 2) O2 produced, but absorbed in oceans & seabed rock; 3) O2 starts to gas out of the oceans, but is absorbed by land surfaces and formation of ozone layer; 4-5) O2 sinks filled and the gas accumulates]]...
ated blood
Blood

Blood is a specialized bodily fluid that delivers necessary substances to the body's Cell s ? such as nutrients and oxygen ? and transports waste products away from those same cells....
 away from the heart, to the body
Body

With regard to organism, a body is the integral physical material of an individual. "Body" often is used in connection with appearance, health issues and death....
, and returns deoxygenated blood back to the heart. The term is contrasted with pulmonary circulation
Pulmonary circulation

Pulmonary circulation is the portion of the cardiovascular system which carries oxygen-depleted blood away from the heart, to the lungs, and returns oxygenated blood back to the heart....
.

he systemic circulation, arteries bring oxygenated blood to the tissues. As blood circulates through the body, oxygen diffuses from the blood into cells surrounding the capillaries, and carbon dioxide diffuses into the blood from the capillary cells.






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Systemic circulation is the portion of the cardiovascular system which carries oxygen
Oxygen

Oxygen no O2 produced; 2) O2 produced, but absorbed in oceans & seabed rock; 3) O2 starts to gas out of the oceans, but is absorbed by land surfaces and formation of ozone layer; 4-5) O2 sinks filled and the gas accumulates]]...
ated blood
Blood

Blood is a specialized bodily fluid that delivers necessary substances to the body's Cell s ? such as nutrients and oxygen ? and transports waste products away from those same cells....
 away from the heart, to the body
Body

With regard to organism, a body is the integral physical material of an individual. "Body" often is used in connection with appearance, health issues and death....
, and returns deoxygenated blood back to the heart. The term is contrasted with pulmonary circulation
Pulmonary circulation

Pulmonary circulation is the portion of the cardiovascular system which carries oxygen-depleted blood away from the heart, to the lungs, and returns oxygenated blood back to the heart....
.

Course

In the systemic circulation, arteries bring oxygenated blood to the tissues. As blood circulates through the body, oxygen diffuses from the blood into cells surrounding the capillaries, and carbon dioxide diffuses into the blood from the capillary cells. Vein
Vein

In the circulatory system, veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary vein and umbilical veins, both of which carry oxygenated blood....
s bring deoxygenated blood back to the heart. Oxygenated blood enters the systemic circulation when leaving the left ventricle
Left ventricle

The left ventricle is one of four heart chamber in the human heart. It receives oxygenated blood from the left atrium via the mitral valve, and pumps it into the aorta via the aortic valve....
, through the aortic semi-lunar valve. The first part of the systemic circulation is the artery aorta
Aorta

The aorta is the largest artery in the human body, originating from the left ventricle of the heart and bringing oxygenated blood to all parts of the body in the systemic circulation....
, a massive and thick-walled artery. The aorta arches and gives off major arteries to the upper body before piercing the diaphragm in order to supply the lower parts of the body with its various branches.
Capillaries
Blood passes from arteries
Artery

Arteries are blood vessels that carry blood away from the heart. All arteries, with the exception of the pulmonary and umbilical arteries, carry oxygenated blood....
 to arterioles and finally to capillaries, which are the thinnest and most numerous of the blood vessels. These capillaries help to join tissue with arterioles for transportation of nutrition to the cells, which absorb oxygen and nutrients in the blood. Peripheral tissues do not fully deoxygenate the blood, so venous blood does have oxygen, but in a lower concentration than in arterial blood. In addition, carbon dioxide and wastes are added. The capillaries can only fit one cell at a time.

Venules

The deoxygenated blood is then collected by venule
Venule

A venule is a small blood vessel that allows deoxygenated blood to return from the capillary beds to the larger blood vessels called veins.Venules are blood vessels that drain blood directly from the capillary beds....
s, from where it flows first into vein
Vein

In the circulatory system, veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary vein and umbilical veins, both of which carry oxygenated blood....
s, and then into the inferior
Inferior vena cava

The inferior vena cava is the large vein that carries de-oxygenated blood from the lower half of the body into the right atrium of the heart....
 and superior
Superior vena cava

The superior vena cava is a large, yet short vein that carries deoxygenated blood from the upper half of the body to the heart's right atrium....
 venae cavae
Venae cavae

The superior and inferior vena cava are collectively called the venae cavae. They are the veins that return deoxygenated blood from the body into the heart....
, which return it to the right heart
Right heart

Right heart is a term used to refer collectively to the right atrium and right ventricle of the heart; occasionally, this term is intended to reference the right atrium, right ventricle, and the pulmonary trunk collectively....
, completing the systemic cycle. The blood is then re-oxygenated through the pulmonary circulation before returning again to the systemic circulation.

Veins

The relatively deoxygenated blood collects in the venous system which coalesces into two major veins: the superior vena cava
Superior vena cava

The superior vena cava is a large, yet short vein that carries deoxygenated blood from the upper half of the body to the heart's right atrium....
 (roughly speaking from areas above the heart) and the inferior vena cava
Inferior vena cava

The inferior vena cava is the large vein that carries de-oxygenated blood from the lower half of the body into the right atrium of the heart....
 (roughly speaking from areas below the heart). These two great vessels exit the systemic circulation by emptying into the right atrium
Right atrium

The right atrium is one of four heart chamber in the human heart. It receives deoxygenated blood from the superior vena cava and inferior vena cava vena cava and the coronary sinus, and pumps it into the right ventricle through the tricuspid valve....
 of the heart
Heart

The heart is a muscle organ in all vertebrates responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods....
. The coronary sinus
Coronary sinus

The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the myocardium of the heart. It is present in humans and other animals....
 empties the heart's veins themselves into the right atrium.

Advantage

Because the systemic circulation is powered by the left ventricle (which is very muscular), one advantage of this form of circulation - as opposed to open circulation, or the gill system that fish use to breathe - is that there is simultaneous high-pressure oxygenated blood delivered to all parts of the body.

See also

  • Pulmonary circulation
    Pulmonary circulation

    Pulmonary circulation is the portion of the cardiovascular system which carries oxygen-depleted blood away from the heart, to the lungs, and returns oxygenated blood back to the heart....
  • Double circulatory system
    Double circulatory system

    The double circulatory system of blood flow refers to the separate systems of pulmonary circulation and the systemic circulation in amphibians, birds and mammals In contrast, Fish anatomy have a single circulation system because they do not have lungs....