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

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