Q:

What is the structure of the circulatory system?

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Quick Answer

The basic circulatory system of vertebrate animals, which are those with a backbone, consists of a heart, the blood and the arteries and system of blood vessels. The heart pumps the blood first to the arteries and then throughout the body via the system of blood vessels.

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What is the structure of the circulatory system?
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Full Answer

The heart is a muscular pump organ with two upper chambers, called atria, where the blood enters. After passing through a valve, the blood then enters one of the two lower chambers, called ventricles. The muscles of the ventricle contract to send the blood out of the heart and into the arteries. About the size of a fist, the heart muscle is extraordinarily durable, pumping about 3 billion times throughout the average human lifespan.

The blood carries nutrients, oxygen, water and waste products to and from the cells and organs through the system of blood vessels that exist throughout the body, sometimes traveling thousands of miles. There are different types of blood vessels.

  • Arteries: connect directly to the heart and carry blood from the heart to the body
  • Capillaries: tiny blood vessels where gases and nutrients pass through the thin walls of capillaries and into the body
  • Veins: carry the blood back to the heart.
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Related Questions

  • Q:

    How does the circulatory system work?

    A:

    The beginning of the blood's journey through the body happens when the heart relaxes between beats and the blood flows from the atria to the ventricles from where the blood is pushed into the large arteries and then on to the smaller arteries where it releases oxygen and nutrients. The blood, now low on oxygen, gets pushed into the veins and travels back to the heart. Once the blood goes back to the heart, it is oxygenated and the process begins again.

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    What are the three functions of the circulatory system?

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    The three functions of the circulatory system include maintaining normal body temperature, helping the body fight disease and providing the ideal chemical balance for homeostasis. The circulatory system consists of the heart, arteries, veins and blood.

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    What is the main function of the circulatory system?

    A:

    The main function of the circulatory system is to move blood and lymph through the body. Doing this transports nutrients and oxygen to the cells of the body and removes waste products such as carbon dioxide. The circulatory system is necessary to regulate temperature and pH balance and protect the body from diseases.

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    What are the parts of the circulatory system?

    A:

    The three major parts of the circulatory system are the heart, blood and blood vessels, according to Hillendale Health. The circulatory facilitates the movement and delivery of oxygen, water and nutrients to the body's cells. This organ system also removes metabolic waste products, such as carbon dioxide, from the blood.

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