Write about 5 to 6 lines on each of the following -ureter, urinary bla...
Ureter: One of the two tubes that carry urine from the kidneys to the bladder. Each ureter arises from a kidney, descends, and ends in the bladder. The ureters are narrow, hollow, muscular tubes, approximately nine inches long, that connect the kidneys to the bladder. Each kidney has its own ureter through which urine passes.
Urine does not flow in a slow, steady stream along the length of the ureters into the bladder. The walls of the ureters are composed of smooth, involuntary muscles that contract at the rate of anywhere between one to five times per minute and, by means of regular, peristaltic waves and gravity, push urine in spurts of about 1.5 teaspoons toward the bladder for storage and for later elimination.
The urinary bladder is an organ present in several animal species which stores urine, delivered by the kidneys through two ureters, prior to urination via the urethra. The human urinary bladder is hollow, muscular, and situated on the pelvic floor. The bladder is structurally composed of a broad fundus, body, apex, and a neck. There are three openings, each covered by a mucosal flab that prevents urine backflow into the ureters. The anatomical position of the bladder differs between men and women. In men, the urinary bladder resides in front of the rectum, whereas in women, it is positioned in front of the uterus. The bladder wall is extremely elastic, stretching from approximately 5 mm to less than 3 mm due to folds called rugae, which cover the inner walls.
The urethra is a tube that connects the urinary bladder to the urinary meatus for the removal of urine from the body. In males, the urethra travels through the penis and also carries semen.
The urinary system, also known as the renal system or urinary tract, consists of the kidneys, ureters, bladder, and the urethra. The purpose of the urinary system is to eliminate waste from the body, regulate blood volume and blood pressure, control levels of electrolytes and metabolites, and regulate blood pH. The urinary tract is the body's drainage system for the eventual removal of urine.[1] The kidneys have an extensive blood supply via the renal arteries which leave the kidneys via the renal vein.