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18 terms

PH Sci Explorer Human Bio & Health Chap 4 Circulation

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cardiovascular system
the body system that consists of the heart, blood vessels, and blood, and that carries needed substances to cells and carries waste products away from cells
heart
a hollow, muscular organ that pumps blood throughout the body
atrium
each of the 2 upper chambers of the heart that receives blood that comes into the heart
ventricle
each of the 2 lower chambers of the heart that pumps blood out of the heart
valve
a flap of tissue in the heart or a veini that prevents blood from flowing backward
pacemaker
a group of cells located in the right atrium that sends out signals that make the heart muscle contract and that regulates heartbeat rate
right atrium
receives blood from the body, the blood is low in oxygen and high in waste produce carbon dioxide
right ventricle
when this contracts, it pumps oxygen-poor blood to the lungs
aorta
largest blood vessel in the body, carries blood from the left ventricle to the body
left atrium
oxygen rich blood movves from the lungs to this
left ventricle
pumps oxygen rich blood to all parts of the body
septum
thick muscular wall separates the left side of the heart from the right side. prevents oxygen rich and osygen poor blood from mising in the heart
arteries
blood vessels that carry blood away from the heart
veins
vessels that carry blood back to heart
capillaries
tiny vessels in which substances are exchanged between the blood and body cells
loop 1 function
blood travels from the hart to the lungs and then back to the heart
loop 2 function
blood is pumped from the heart throught the body and then returns again to the heart
force
a push or a pull on the blood produced when the ventricle muscles contract