Excretory System Key Point #1: There are three main organs in your excretory system Skin Kidney Bladder

Skin Sweat is released out your sweat glands Excretes extra water and salt in the form of perspiration (sweat) Sweat is released out your sweat glands

Kidneys They are located on either side of your spinal cord in your lower back.

Bladder The bladder stores urine

The Excretory System Key Point #2: The excretory system has four main functions Get rid of excess water and salts in your body Maintain the pH of blood [acid level] Remove waste products from the blood Control the amount of water in the blood

Where in the body does filtration actually occur? Key Point #3: Blood is cleaned (filtered) in small units of the kidneys called nephrons.

Steps of blood filtration in the kidney Blood filled with waste enters the kidney through the renal artery The kidney removes urea, excess water, and other waste products from the blood Urea= the major waste product in your blood The clean, filtered blood leaves the kidney through the renal vein and returns to circulation

Where do all the wastes go? Key Point #4: The waste products taken from the blood travel from the kidney to the urinary bladder through a tube called the ureter

These wastes are then stored in the bladder as urine Eventually the wastes exit your body through the urethra

Summary Renal arteryKidneynephron Ureterbladderurethra Blood must be cleaned (filtered) Wastes in the blood follow this path Renal arteryKidneynephron Ureterbladderurethra

Guided Practice Which of the following best describes the word filtration? Adding good things to your blood Removing the bad things from your blood Separating red and white blood cells Cleaning urine before exiting your body

What are the 3 organs of the excretory system?

What is the tube called that takes urine from the bladder to outside the body?

Which of the following organs stores urine? a)Urethra b)Urerter c) Bladder d) Kidney

Which of the following organs actually filters your blood?

What are the small units in your kidney that filter blood?

What is “c” called? D A C B

Which structure brings blood into the kidney?

Which of the following is not a waste product produced by your body? Oxygen Urea Carbon dioxide Salt

The renal vein returns ___________ to the body while the ureters deliver _____________ to the bladder urine; blood Urine; urine Blood; carbon dioxide Blood; urine

Which of the following is in the correct order? bladder, ureter, urethra, kidney Renal vein, kidney, ureter, bladder, urethra Renal artery, kidney ureter, bladder, urethra Kidney, bladder, ureter, urethra