<prompt> The tubuloglomerular feedback is mediated by:Sensing of Na concentration in the macula densaSensing of Cl concentration in macula densaSensing NaCl concentration in the macula densaOpening up of voltage gated Na channels in afferent aeriole  <response>: C i.e. Sensing NaC1 concentration in the macula densaTo perform the function of auto regulation, the kidneys have a feed back mechanism tubuloglomerular feed back that links changes in sodium chloride concentration at the macula densa tubular component with the control of renal aeriolar resistance. glomerular component. 