346 Circulator y, Respirator y, and Excretor y Systems
muscle contractionarteriesatherosclerosiscapillariesheartpacemakerplasmaplateletsred blood cellsvalvesveinswhite blood cellsCirculatory, Respiratory, and Excretory Systems
Section 34.1 Circulatory System
Scan Section 1 of the chapter. Identify and list the functions of blood.- • • • • •
Use your book or dictionar y to define muscle contraction.Use the new vocabular y terms to complete the paragraph below.
Large blood vessels called carry oxygenated blood
away from the heart. The blood flows into microscopic ,
where the blood exchanges oxygen and wastes with body cells.
Then carry deoxygenated blood back to the heart. In
these large vessels, flaps of tissue called prevent blood
from flowing backward. The hollow, muscular pumps
blood throughout the body. A in the right atrium sends
out signals that tell the heart muscle to contract. Over half of blood
is made up of a clear, yellowish fluid called. The function
of is to carry oxygen to all body cells. The
are the body’s disease fighters. Cell fragments
called help to form blood clots at a wound site. Blood
clots, fat deposits, or other materials can block the flow of blood
through the arteries, resulting in a condition called.New
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