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 moves from the kidney to the bladder. A diagram of a kidney. The renal tubule is part of the filtration system in the nephrons of the kidneys. The distal convoluted tubule helps regulate the pH of the urine by secreting positively charged protons. The kidney contains 4 million nephrons, which are responsible for filtering the blood.