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.
The ureter is the tube through which urine drains from the kidney into the bladder. When a kidney stone is being passed, a ureter can become inflamed. People suffering with a kidney stone, which can irritate the ureters, may experience blood in their urine.