How many letters does the top answer for “a blood vessel that carries blood from the capillaries toward the heart” have?

The most common answer is vein (4 letters).

Crossword clue: a blood vessel that carries blood from the capillaries toward the heart

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

vein 4 letters wn-def

a blood vessel that carries blood from the capillaries toward the heart

vena 4 letters wn-def

a blood vessel that carries blood from the capillaries toward the heart