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md0006 - BASIC HUMAN ANATOMY.pdf - Raems.com

md0006 - BASIC HUMAN ANATOMY.pdf - Raems.com

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18. In the case of collateral circulation, if one blood vessel to an area is<br />

damaged, then . However, when an end artery<br />

is damaged, the receiving area will usually .<br />

19. PULMONARY CYCLE:<br />

In which chamber of the heart does the pulmonary cycle begin?<br />

Contraction of the wall of the right ventricle forces the valve to<br />

close. This keeps blood from flowing back into the . The pressure forces<br />

blood past the valve into the . Upon relaxation of the right<br />

ventricle, back pressure of the blood in the pulmonary trunk closes the valve.<br />

The blood then passes into the through the pulmonary arterial system. Gases are<br />

exchanged between the of the lungs and the blood in the next to the<br />

alveoli. The oxygenated blood is collected by the and carried to the<br />

of the heart. This <strong>com</strong>pletes the pulmonary cycle.<br />

20. SYSTEMIC CYCLE:<br />

Oxygenated blood is moved from the left atrium into the .<br />

Contraction of the wall of the left ventricle closes the valve, which prevents<br />

blood from returning to the . The pressure forces blood past the<br />

valve into the . Upon relaxation of the left ventricular wall,<br />

back pressure of the blood in the aortic arch closes the valve. The blood then<br />

passes through the various to the . Materials are exchanged<br />

between the blood and cells of the body in the . The blood returns to the<br />

of the heart in vessels called .<br />

21. The head is supplied by the arteries. The neck and upper<br />

members are supplied by the arteries. The aortic arch continues as a<br />

large single vessel known as the . At the lower end of the trunk, the aorta<br />

divides into the right and left arteries, supplying the pelvic region and lower<br />

members.<br />

22. Running parallel to the arteries is the system of veins. Immediately<br />

beneath the skin is a network of veins. These veins collect and then join the<br />

deep veins in the (armpits) and the (groin). Collecting the blood from<br />

the head, neck, and upper members is the superior . Collecting the blood<br />

from the rest of the body is the . Thus, the final major veins,<br />

emptying the returned blood into the right atrium of the heart, are the .<br />

Except the veins from the head, veins are generally supplied with s to assist<br />

in making blood flow toward the heart. Carrying absorbed substances from the gut to<br />

the liver is the . After being specially treated and conditioned, this<br />

blood is returned to the general circulation by the veins.<br />

MD0006 9-21

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