The term arthritis is used to describe numerous rheumatic diseases and conditions that affect joints. Some forms of arthritis, such as rheumatoid arthritis and lupus, can affect multiple organs and cause widespread symptoms.he term arthritis is used to describe numerous rheumatic diseases and conditions that affect joints. Some forms of arthritis, such as rheumatoid arthritis and lupus, can affect multiple organs and cause widespread symptoms.
The urinary system consists of the kidneys, ureters, urinary bladder, and urethra. The kidneys filter the blood to remove wastes and produce urine. The ureters, urinary bladder, and urethra together form the urinary tract, which acts as a plumbing system to drain urine from the kidneys, store it, and then release it during urination.
The urinary system eliminates wastes, controls blood volume, regulates blood ion concentration and pH, and regulates red blood cell production. Functions of the Urinary System The kidneys excrete waste products. The kidneys control blood volume by regulating the volume of urine produced. The kidneys help regulate the concentration of major ions in the body fluids. The kidneys help regulate pH of the body fluids. The kidneys regulate the concentration of erythrocytes in the blood. The kidneys participate, with the skin and liver, in vitamin D synthesis. Urinary System Kidneys Each kidney is behind the peritoneum and surrounded by a renal capsule and a renal fat pad.