Full transcript
0:00Veins are blood vessels containing blood flowing to the heart.
0:03While arteries have blood flowing from the heart.
0:06The blue is representative of blood vessels containing
0:09deoxygenated blood,
0:10while the red blood vessels have oxygenated blood fresh from the
0:13lungs. Now, let's follow the path of the blood through the
0:16heart. The superior vena-cava receives blood from
0:19the head, neck, upper limbs and chest.
0:22Meanwhile, the inferior vena-cava receives blood
0:25from the trunk, viscera, and lower limbs.
0:28both superior and inferior vena-cava
0:31end up in the right atrium, one of the four chambers of the heart.
0:34The heart not only has four chambers, it also has four
0:37valves. The purpose of the valves is to keep
0:40blood moving in the right direction and not flow backwards.
0:43Blood exits the right atrium through the tricuspid valve
0:46so called because it has three flaps, and
0:49enters the right ventricle. the blood exits the
0:52right ventricle through the pulmonary valve and enters the
0:54pulmonary artery. Again, it is an artery because
0:57blood is flowing away from the heart, but it is blue because
1:00it lacks oxygen.
1:02The pulmonary artery then splits into the left and right
1:05pulmonary arteries, which go to each respective lung.
1:08In the lungs, gas exchange occurs.
1:11The blood discards carbon dioxide and picks up oxygen.
1:14Now, blood comes back from the lungs through the pulmonary veins,
1:17entering the left atrium. Next, the blood is pumped into the left
1:20into the left ventricle through the mitral, or bicuspid valve.
1:24finally, the oxygenated blood leaves the left ventricle
1:27through the aortic semi-lunar valve, entering the
1:30aortic arch.
1:32the aorta, which is the largest of all the arteries, distributes the
1:35oxygenated blood to the rest of the body. The aortic
1:38arch has three major branches, which supply
1:41the head and arms with blood. Then, the aorta
1:44curls downward from behind the heart, forming the descending aorta,
1:47which descends through the chest and continues down through the abdomen.
1:51In the abdomen, the descending aorta splits to supply the pelvis
1:54and legs with blood.
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