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

Las células del nodo sinusal presentan
The cells of the sinus node present

Uno de los fármacos que se administran en el tratamiento de las convulsiones es
One of the drugs that are administered in the treatment of seizures is

En un diseño cuasiexperimental

In a quasi-experimental design