circulatory system 4

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septum

it is the heart wall; it separates the two sides (left and right) of the heart

atrium

what the two upper (left and right) chambers of the heart is called; together, these two makes up the atria. These are the receiving chambers of the heart.

atria

this have thin-walled muscles that is made up of the left atrium and the right atrium found in the upper chambers of the heart

ventricles

what the two lower chambers (or pumping chambers) of the heart is called. these have thicker and more muscular walls than the atria because these are the pumping chambers which are responsible for keeping the blood moving.

right atrium

found on the right side of the heart, this is the atrium which receives blood from the body

right ventricle

found on the right side of the heart, this ventricle pumps blood into the lungs and from where the blood goes to the left side of the heart.

left atrium

found on the left side of the heart, it is through this that the oxygenated blood (or the blood passed through the lungs) goes back to the heart.

left ventricle

from the left atrium, the blood goes here; this pumps the blood that keeps moving throughout the body

valves

parts of the heart that act like doors; these are flaps of tissues that open and close allowing blood to flow only in one direction.

heartbeat

this is the tightening of the heart muscles to force blood through the blood vessels; on average this happens around 70 to 80 times a minute, depending on your activities

lub

the sound of the heartbeat when the valves between chambers close and the ventricles contract, which means that blood is pumped out of the ventricles and enters the atria.

dub

you hear this when ventricles relax and another set of valves closes.

superior vena cava and the inferior vena cava

largest veins in the body; it is through these veins that blood low in oxygen and high in carbon dioxide enters the right atrium of the heart

pulmonary arteries

the right ventricle pumps the blood into these which then takes the blood to the lungs

aorta

the largest artery in the body; this sends blood to all tissues in the body

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