Question

How does the bladder and the brain work together?

The brain sends a message to the bladder to let it know that it is full of urine.
The bladder releases a substance that travels through the blood to the brain.
The bladder sends a message to the brain through the nerves when it is full of urine.
When full, the bladder passes the urine to the kidneys that send a message to the brain.

Answer 1

The brain sends a message to the bladder to let it know that it is full of urine.

Step-by-step explanation:

The bladder releases a substance that travels through the blood to the brain.

The bladder sends a message to the brain through the nerves when it is full of urine.

When full, the bladder passes the urine to the kidneys that send a message to the brain.

Answer 2

The brain sends a message to the bladder to let it know that it is full of urine.

Not a literal message. A message in the body that makes you get up to urine.