megan+and+george+Scripts+period+3

Script:

(In Jacob's Room) George: Welcome to "How it Works" Special Edition: the Excretory System with George and Megan!!! Megan: Today we are going to show you how the Excretory System works. George: The main purpose of the Excretory System is to excrete waste. Hence the name "Excretory" system. Megan: It also responsible for getting rid of nitrogeneous waste products and non useful nitrogeneous materials. George: It's job is to take the toxins in the body and known as urea and turn it into urine. Megan: There are four main organs to the Excretory system. (pic shows up on screen, talking in background) G: There are the two kidneys(circle or put arrow near the pic of kidneys) M: The urethra (shows w/ arrow) G: The ureter(same as above) M: And lastly, the bladder (same as above) G: First we are going to start with the kidneys. (zooms in on kidneys) M: Everyone has two kidneys, a left one and a right one. (show more detailed pic of kidney) The main purpose of the kidneys is to filter unneeded liquids from the blood. G: This consists of a toxin called urea or nitrogen. Urea is basically a substance secreated, or discharged by the liver and taken out of the blood from the kidneys. (find pic of medulla and cortex, or go back to view of M&G) M: There are two different parts of the kidney: the medulla and the cortex. The medulla is the inner part of the kidney, where all the nutrients are reabsorbed in the blood stream. G: The cortex is the outer part of the kidney. It contains all the nephrons- or microscopic filters. M: The kidneys are a very important organ in the body- as is the urethra. G: Right, (go back to full body pic and zoom in on urethra) this is called the urethra. Its main function is that it is a passageway for releasing urine from the body. M: The urethra is attached to the bladder. G: It's main purpose is to discharge urine. M: It is basically a membraneous tube. G: Our next organ is the ureter.(show pic of full body, zoom in on ureter) M: (indicate with arrow pic) The ureter's purpose in the body is to drain urine from the kidneys and release into the bladder. G: The ureter has a diameter of about 3 millimeters. M: And is lined with transitional epithelium, like the bladder. G: Speaking of the bladder, that is our final organ (show full body pic and indicate w/ arrow) M: The bladder is a muscle sac and stores urine until the muscle relaxes. G: And the bladder collects urine for excretion. M: It is hollow and distensible- or elastic. G: Urine enters into the bladder through the ureters and it leaves through the urethra. M: Well, that concludes our show today. G&M. That is how the excretory system works.