This @BiologyBugbears video is a summary to cover the structure of the urinary system and urine formation. This is simply another revision option which details the structure of the nephron and the 3 stages of urine formation. This video is an optional revision resource-students should always read textbooks! Please note a type Sphincter is correct spelling! This video is to help cover the topic in one sitting and give you a boost when you are trying to complete exam question revision.