Functions and arguments in cart

I am doing a course for Js and an almost existential doubt arose. I attach the code below

function leerDatosCurso(curso) {

  const infoCurso = {
    imagen: curso.querySelector('img').src,
    titulo: curso.querySelector('h4').textContent,
    precio: curso.querySelector('.precio span').textContent,
    id: curso.querySelector('a').getAttribute('data-id')
  }

  añadirCarrito(infoCurso);

}

function añadirCarrito(curso) {
    const row = document.createElement('tr');
    row.innerHTML = '

        <td><img src="${curso.imagen}"></td>
        <td>${curso.titulo}</td>
        <td>${curso.precio}</td>
        <td>
          <a href="#" class="boton-borrar" data-id="${curso.id}">X</a>
        </td>  
    ';

    //agrego este template a lista cursos

    listaCursos.appendChild(row);
}

I can not elucidate the following .. for the function addCarrito I pass it as an argument course ... all right up there, but because in the function of readingCatData (within this) we call the addCarrito function ( infoCurso ). if afterwards for the addCarrito function I use another parameter.

ANY HELP HELPS TO CONTINUE LEARNING FRIENDS.