The Excretory System

Which of these is the correct sequence of urine moving through the urinary system?

• kidneys, ureters, bladder, urethra
  
• bladder, kidneys, ureters, urethra
  
• kidneys, urethra, bladder, ureters
• ureters, kidneys, bladder, urethra
  

_______ failure can lead to a buildup of waste products in the body.

• Bladder
• Urethra
• Kidney
• Ureters

The _______ is an elastic, muscular organ that holds urine until it leaves the body.

• Bladder
• Ureter
• Nephron
• Urethra

What is the main function of the respiratory system?

• to provide oxygen and remove carbon dioxide from the body

• o break down food and absorb nutrients

• to remove oxygen from the body and deliver carbon dioxide

Under normal circumstances, what substances should be found in urine?

• water, protein, salt

• salt, white blood cells, platelets

• glucose, urea, protein

• water, salt, urea

Tiny structures known as _________ are found in the kidneys to filter the blood.

• alveoli

• cilia

• villi

• nephrons

The lungs, kidney and skin are all part of the

• nervous system
• nephron
• kidney
• excretory system

Which of the following mainly excretes CO₂?

• skin
• kidney
• lungs
• urethra

Which of the following mainly excretes water and heat?

• skin
• kidney
• lungs
• urethra

The ________ is made up of a million ___________.

• kidney, ureters
• nephron, kidneys
• lungs, nephrons
• kidneys, nephrons