1 DO marinate food in the refrigerator, rather than at room temperature. 2  DO marinate in re-sealable plastic bags, rather than in bowls or other containers. 3  They cut down on cleanup and allow you to evenly distribute the marinade. 4  But you can marinate in plastic, stainless steel or glass containers too.
Antidiuretic hormone is secreted from the posterior pituitary; it increases water permeability in the last segment of the distal tubule. Renin stimulates the renin-angiotensin-aldosterone system, which can increase systemic arterial pressure and change renal blood flow.
In that case... Secretion is an active process. In the kidney tubules, somethings, like K+ is secreted from the peritubular capillaries, into tubular cells, and then out into the lumen to mix with the fluid. Excretion is passive. What is excreted by the kidneys is everything that is not reabsorbed and what is secreted.