Blood Flow to the Skin

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Brief Statement: The blood flow to your skin is important because it serves as a heat regulator. According to your bodies temerature your capillaries and blood vessels constrict or dilate.

Longer Explaination: When you are hot, you sweat, which cools your body's temerature because of the evaporation taking effect. When you are cold, blood vessels become narrowed and your skin becomes pale and cold. This occurs because it conserves heat from escaping throught the skin so it can be used with the more vital organs.

The skin is composed of two layers, the outer protective layer called the epidermis and the inner layer called the dermis. The epidermis is composed of dead cells and the dermis is called the living layer because it contains glands, blood vessels, nerves, connective tissue, etc.

 

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Sample Problems:






(1) What are the two layers that make up skin?
(2) When do your blood vessels in the skin become narrowed?
(3) Why do blood vessels become narrowed? 





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Answers:





(1) Epidermis (outer) and Dermis (inner).
(2) They become narrow when you are cold; body temperature drops.
(3) Blood vessels narrow in order to conserve heat for other vital organs.




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For more information on this topic, please refer to Berne & Levy , Chapter 4

Also, check out the following links that may be helpful:

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This page was written by Edwin M. Valladares , a student in this course.

BME 403 Pages maintained by the T.A., Douglas Miles.