Muscle tone. Definition. noun. (1) The muscle in a steady partially contracted state caused by the successive flow of nerve impulses. (2) The amount of tension or resistance to movement in a muscle. Supplement. Muscle tone or tonus helps in maintaining body posture.
Hydronephrosis is the distention of the pelvis and calyces of one or both kidneys, resulting in thinning of the renal tubules because of obstructed urinary flow. When the obstruction is a stone or kink in one of the ureters, only one kidney is damaged.
Dehydration is an ambiguous term that does not distinguish between simple water loss and loss of Na+. Both water loss and Na+ loss are associated with a decrease in the ECF volume, which is determined by the amount of Na+ in the body and not by the Na+ concentration in the plasma.1. Isosmotic dehydration.ecreased renal water excretion. 1. Decreased glomerular filtration rate. 2. Increased proximal tubular reabsorption. Decreased renal perfusion pressure in diseases such as congestive heart failure, cirrhosis, nephrotic syndrome stimulates proximal tubular reabsorption. 3.