The urine route

The idea

Human excretory organs are a pair of kidneys, a pair of ureters, a urinary bladder and a urethra; urine passes from the kidneys via the ureters to the muscular bladder, stored under nervous control until passed out through the urethra.

Where does urine go?

Urine is made inside the body and leaves it after some time.

Do you think urine goes straight out as soon as it is made?

• No, it is stored first
• Yes, at once
• It never leaves

Follow the urine

Press Next step to add one part at a time.

Four parts

The excretory system includes a pair of kidneys, a pair of ureters, a urinary bladder and a urethra. Urine made in the kidneys goes down the ureters to the muscular bladder. It is stored there, under nervous control, until it is passed out through the urethra.

Human excretory organs are a pair of kidneys, a pair of ureters, a urinary bladder and a urethra; urine passes from the kidneys via the ureters to the muscular bladder, stored under nervous control until passed out through the urethra.

Notes

Human excretion: a pair of kidneys, a pair of ureters, a urinary bladder (muscular, nervous control) and a urethra.

Check yourself

Through which tubes does urine pass from the kidneys to the urinary bladder?

Where is urine stored until it is released?

Why can we usually control the urge to urinate?

How many kidneys are there in the human excretory system?

Answer: 2

The system includes a pair of kidneys, one on either side of the backbone.

• The urethra. The urethra carries urine from the bladder out of the body.
• The food-pipe. The food-pipe takes food from the mouth to the stomach.
• The ureters — correct. Yes!
• In the urinary bladder — correct. Yes!
• In the kidneys. Urine is produced in the kidneys and then passes to the bladder.
• In the ureters. The ureters connect the kidneys with the bladder.
• The kidneys stop making urine. Urine continues to be produced in the kidneys.
• The bladder is muscular and under nervous control — correct. Yes!
• The ureters close the bladder. The book says the bladder is muscular, so it is under nervous control.