A&P II Notes Feb 27

A&P II Notes Feb 27 - Anatomy& Physiology II...

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Unformatted text preview: Anatomy & Physiology II Notes – 2/27/07 Cardiovascular System cont. • Blood pressure elevation is a blood pressure danger sign • Blood pressure – lowest in the veins (decreases as blood gets farther from the heart), regulated by arteries and arterioles • Degree of resistance to blood flow is due to the state of blood vessels (arteries and arterioles) • Blood vessels – o Arteries – have to maintain a high pressure (especially those close to the heart) so they have a thick wall, have the ability to increase their lumen as blood is pumped into them during systole Lumen – space where blood flows through • Larger diameter allows for easier flow (less resistance) Tunica media – very thick layer of smooth muscle and layers of elastic tissue, middle tunic, contributes to the capacity of the arteries to expand and contract • Compliance – ability of arteries to expand and contract again, decreases with age and cardiovascular disease • Rigidification of the artery wall so the lumen cannot increase as much, which means that the resistance increases and this makes the heart have to pump harder • Deposition of plaque also causes increased resistance...
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This note was uploaded on 04/18/2008 for the course BI 132 taught by Professor Halpern during the Fall '07 term at BC.

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A&P II Notes Feb 27 - Anatomy& Physiology II...

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