how does the circulatory system work?

Answer 1

Pump
Non-return valves
Pipe

Answer 2

The heart is a core playing member of the circulatory network and can be described as a small 9 ounce or 30 gram cavernous fist sized intertwining muscle located behind the breastbone and centered perpendicular to the midline of the chest. Through its pumping action it helps to circulate blood through the body.The heart must be unceasingly supplied with rich fresh oxygen and used blood must be returned to the lungs for reoxygenation. It has a right and left side partitioned by a sinewy wall of muscle called a septum . Each side has two chambers. A healthy circulation depends to a large extent on the pipelines through which the blood and its components flow.Therefore to meet its need for fresh blood, the heart has its own circulation network, consisting of arteries and veins

Answer 3

The heart pumps blood into the aorta, the largest artery, which then splits to carry blood up to places above the heart and down to places below the heart. Whatever organs are served, the arterial blood flows into smaller and smaller arteries, finallly giving up its oxygen and nutrients through the smallest blood vessels, the capillaries. Those important elements diffuse throught the walls of capillaries into the muscles and organs, and waste products enter the capillaries in about the same areas. Those waste products would include carbon dioxide and water. The blood cells and the waste products continue into larger blood vessels, now called veins because they are headed back to the heart. Those veins enter the heart through one major vein.
The heart has a total number of 4 pumping chambers; each chamber just squeezes. The pumping chambers are organized into two pairs; each pair has a part called an auricle and a part called a ventricle. One pair is pumping for most of the body, and the other pair is pumping to the lungs alone. The blood flows in one direction only because the valves between the chambers and those at the entry and exit to each chamber will allow only one direction of flow. That is, an entry valve is forced closed by the squeezing action, while an exit valve is forced open by the same action of the heart. The pumping (squeezing and releasing) goes on continuously from before birth to death.
The timing (the rate of pumping) is controlled by an electrical signal originating in one spot of the heart. That nerve reacts to the body's signals for when it is resting and when it needs extra pumping to accomplish hard work. Having central control over the pumping prevents the various chambers from pushing against each other. The pumping action of the heart has to be strong enough to push all of the blood from the heart through all of the arteries, capillaries, and veins, so a lot of pressure is required. The proper action of the heart is measured in a very basic way by checking the blood pressure when the heart is squeezing (the systolic pressure) and the blood pressure between squeezes (the diastolic pressure). Those two numbers are typically recorded or announced when heart monitoring is going on.
There is also a route for the blood to take from the heart to the lungs and back to the heart, just to release carbon dioxide and pick up oxygen. The oxygen actually combines with an element inside the red blood cells (it does not remain a gas).
There are special areas in the lungs where the gasses can transfer in and out of the blood because the blood vessel walls are so thin -- another kind of capillary.

Sorry that I've forgotten the names for these functional parts.

Answer 4

SEE ANIMATED HEART FUNCTION IN BELOW LINK
http://library.thinkquest.org/2935/Natures_Best/Nat_Best_High_Level/Circulatory_Net_Pages/Circulatory_page.html
The heart is a core playing member of the circulatory network and can be described as a small 9 ounce or 30 gram cavernous fist sized intertwining muscle located behind the breastbone and centered perpendicular to the midline of the chest. Through its pumping action it helps to circulate blood through the body.The heart must be unceasingly supplied with rich fresh oxygen and used blood must be returned to the lungs for reoxygenation. It has a right and left side partitioned by a sinewy wall of muscle called a septum . Each side has two chambers. A healthy circulation depends to a large extent on the pipelines through which the blood and its components flow.Therefore to meet its need for fresh blood, the heart has its own circulation network, consisting of arteries and veins .



http://www.imcpl.org/kids/guides/health/circulatorysystem.html
http://www.answers.com/topic/3dscience-cardiovascular-system-jpg

Answer 5

the heart pumps blood through the body and this is how it works.