In this task, you are given a sentence in the Spanish language. Your task is to translate the Spanish sentence into the English language.

[EX Q]: ¿Qué compuesto actúa como amortiguador de sulfhidrilos y como antioxidante?
[EX A]: Which compound acts as a sulfhydryl buffer and as an antioxidant?

[EX Q]: Según el mecanismo de Frank-Starling del corazón, en condiciones fisiológicas el gasto cardíaco es directamente proporcional a
[EX A]: According to the Frank-Starling mechanism of the heart, under physiological conditions the cardiac output is directly proportional to

[EX Q]: La vitamina K es el antagonista específico para
[EX A]:
Vitamin K is the specific antagonist for