Circulatory Pathways

Circulatory Pathways - deoxygenated blood travels from the...

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Circulatory Pathways Blood is confined to a closed system of  blood vessels and to the four chambers  of the heart (essentially dilated  vessels). Blood travels away from the  heart through arteries, which branch  into smaller vessels, the arterioles.  Arterioles branch further into the  smallest vessels, the capillaries. Gas,  nutrient, and waste exchange occurs  across the capillary walls. The blood  returns to the heart as capillaries merge  to form venules, which further merge to  form large veins, which connect to the 
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heart. Blood circulates through the  following two separate circuits: In the pulmonary circulation, 
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Unformatted text preview: deoxygenated blood travels from the right side of the heart to each of the two lungs. Within the lungs, O 2 enters and CO 2 leaves the capillaries by diffusion. Oxygenated blood returns from the lungs to the left side of the heart. In the systemic circulation, oxygenated blood travels from the left side of the heart to the various areas of the body. Gas, nutrient, and waste exchange occurs across the capillary walls into the interstitial fluids outside the capillaries and then into the surrounding cells. The deoxygenated blood returns to the right side of the heart....
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Circulatory Pathways - deoxygenated blood travels from the...

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