capillary
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
The smallest type of blood vessel, with walls only one cell thick, where oxygen and nutrients pass into tissue.
Test yourself
Which word fits the gap? "Oxygen diffuses out of the blood and into muscle cells through the walls of the _____."
Answer: capillary
In your own words, what does "capillary" mean?
The smallest type of blood vessel, with walls only one cell thick, where oxygen and nutrients pass into tissue.
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