Grade 9 - The Excretory System

What role does the skin have in the excretory system?

• Removing dead skin cells

• Removing old hair follicles

• Removing liquid waste in sweat

• Protecting against infection

What organ is responsible for filtering the blood?

• Lungs

• Bladder

• Kidneys

• Heart

What is the name of stretchy, muscular organ responsible for holding urine until you decide to use the bathroom?

• Kidneys

• Urethra

• Ureter

• Bladder

Which structure transports urine from the kidney to the bladder?

• Ureter

• Urethra

• Bladder

• Kidney

What is the name of the structure that leads from the bladder to the outside environment?

• Ureter

• Bladder

• Urethra

• Kidney

In addition to water, the principal components of urine are

• amino acids and fatty acids
• urea and salts
• ammonia and bile
• hydrochloric acid and bases

The excretory system is responsible for moving toxic wastes, dissolved molecules, and excess heat. You would conclude that the excretory system contributes to

• circulating molecules around the body

• maintaining homeostasis in the body

• producing glucose

• gas exchange

Which sequence represents the correct pathway for the removal of urine from the human body?

• kidney → ureter → urinary bladder → urethra
• kidney → urethra → urinary bladder → ureter
• ureter → kidney → urinary bladder → urethra
• urethra → kidney → urinary bladder → ureter
  

In humans, the organ that most directly regulates the concentration of water in the blood is the

• heart
• liver
• pancreas
• kidney

Which excretory organ eliminates water and some chemical wastes in perspiration (sweating)?

• lungs

• skin

• liver

• kidneys