The singular of capillaries is capillary.
As in "we all have a capillary"
Alveoli. Singular is alveolus.
oxygen and carbon dioxide are exchanged in alveoli (singular alveolus).
continuous capillaries continuous capillaries
One alveolus is a singular, tiny air sac of the lung, surrounded by a network of capillaries, and through which oxygen and carbon dioxide are exchanged. A cluster of such air sacs are alveoli (plural of alveolus).
Capillaries The smallest of the blood vessels: capillaries.
Capillaries are the structures that connect arteries to veins.
Arteries "feed" the capillaries while veins drain the capillaries.
plmonary veins begin as capillaries and end as capillaries
Sinusoidal Capillaries
The thin walled blood vessels are called capillaries.
continuous capillaries
capillaries.