00:01
To trace the path of a molecule of carbon dioxide from an arteriole in the right thumb to its exhalation from the body, we need to consider the circulation of blood and exchange of gases in the body.
00:15
So, first is arterioles.
00:23
The molecule of carbon dioxide starts in an arteriole in the right thumb where it is carried by oxygen depleted blood.
00:32
The next is capillary bed.
00:35
The arteriole leads to a capillary bed in the thumb region.
00:45
In this capillary bed, the carbon dioxide diffuses out of the bloodstream and enters the surrounding tissues.
00:54
The next is venule.
00:59
After passing through the capillary bed in the thumb, the deoxygenated blood now carrying the carbon dioxide enters a venule.
01:09
The venule collects blood from the capillaries and transport it towards the heart.
01:17
Next is vein.
01:20
The venule joins with other venules to form a vein which carries the deoxygenated blood and carbon dioxide towards the heart.
01:30
The next is right atrium...