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 kidneys ensure that the make-up and volume of the fluids in the body is correct. They help control the chemical balance of the blood and regulate the bodyâs level of sodium, potassium and calcium. The kidneys remove waste products and excess water from the body and so help to regulate blood pressure.They activate vitamin D, which helps to maintain strong bones, and produce erythropoietin, a hormone that is vital for the production of red blood cells.Each kidney contains 1.0-1.5 million small tubes called nephrons. The kidneys filter blood through a network of small blood vessels called the glomerulus.he kidneys ensure that the make-up and volume of the fluids in the body is correct. They help control the chemical balance of the blood and regulate the bodyâs level of sodium, potassium and calcium. The kidneys remove waste products and excess water from the body and so help to regulate blood pressure.