This lesson will focus the purpose and structure of the cardiovascular system by looking at the:
The purpose of the cardiovascular system, also sometimes called the circulatory system, is to move blood throughout the body. Blood provides our tissues with oxygen and other necessary materials, and it also aids in the removal of CO2. Without this circulation, you would not live.
The cardiovascular system is composed of:
There are actually five different types of blood vessels: arteries, arterioles, capillaries, venules, and veins.
When blood first leaves the heart it travels through the arteries; which are large in diameter. Arteries then branch off into arterioles. Arterioles are similar to arteries in that they also carry blood away from the heart, but arterioles are smaller in diameter. Arterioles will eventually branch into capillaries, which are even smaller in diameter.
Capillaries are the smallest blood vessel in our body, and are where substances are allowed to diffuse from the blood into tissues. This can happen because they are made of a single, very thin, membrane layer. Capillaries from there will start to branch back into venules. Venules are larger in diameter than capillaries, but are still small and still allow for some substances to diffuse. They are starting the transport of blood back to the heart. From here, blood moves into veins, which have a larger diameter than venules. The purpose of veins is to transfer blood back to the heart.
The Cardiovascular System includes the heart and blood vessels. Its purpose is to circulate blood and nutrients throughout your body. There are five different types of blood vessels. Blood moves away from the heart through the arteries,then to the arterioles, and into the capillaries. Here blood diffuses substances into and out of the blood stream. Blood begins to return to the heart through venules, then into veins.
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Source: SOURCE: THIS WORK IS ADAPTED FROM SOPHIA AUTHOR AMANDA SODERLIND
A large diameter blood vessel that returns blood to the heart.
A small diameter blood vessel that returns blood to the heart.
The smallest blood vessel that acts as a zone of diffusion between blood and tissues.
A smaller diameter blood vessel that carries blood away from the heart.
A large diameter blood vessel that carries blood away from the heart.
Tubes that carry blood to and from the heart and body.
A muscular pump that pumps blood throughout the body.
A body system composed of the heart and blood vessels that acts to transport blood throughout the body.