text: function calcular() {
  
     let txtpeso = window.document.getElementById('Tpeso').value
     let peso = parseFloat(txtpeso)
  
     let txtvt = document.querySelector('input[name="VolTot"]:checked').value
     let vt = parseFloat(txtvt)
     let txtve = document.querySelector('input[name="VolExt"]:checked').value
     let ve = parseFloat(txtve)
  
        
      totSangue = (peso * 10) * vt
      doaSangue = (totSangue / 100) * ve
      doaSangueEnd = (totSangue / 100) * ve
  
  
     txtSangue.innerHTML = totSangue + " ml"
     txtDoaSangue.innerHTML = doaSangue + " ml"
     resultFinal.innerHTML = doaSangueEnd + " ml"
  
     
      
  }
  