Urinary System

Define excretion in your own words.

• The removal of metabolic wastes produced by the body

• The intake of nutrients into the bloodstream

• The conversion of food into energy within cells

• The movement of blood through the heart

Tags

NGSS.MS-LS1-3

NGSS.MS-LS2-3

What are two functions of the urinary system?

• Excretes waste

• Maintain water balance in the body (homeostasis)

• Oxygenate blood in the lungs

• Produce bile for fat digestion

• Control skeletal muscle movement

Tags

NGSS.HS-LS1-3

How many kidneys are typically found in the human body?

• One

• Two

• Three

• Four

How big are healthy kidneys?

• About the size of a clenched fist

• About the size of a grape

• About the size of a basketball

• About the size of a fingernail

What are three functions of the kidneys?

• Filter blood to to regulate its chemical composistion

• Regulate body water levels

• Eliminates nitrogenous wastes made by the cells

• Produce digestive enzymes for the small intestine

• Exchange oxygen and carbon dioxide with the air

Tags

NGSS.HS-LS1-3

What is urea?

• A nitrogenous waste formed from the conversion of ammonia

• A sugar used by cells for energy

• A gas exhaled by the lungs

• A hormone that stimulates red blood cell production

Where is urea produced?

• Liver

• Kidneys

• Stomach

• Pancreas

Tags

NGSS.HS-LS1-3

Explain how ammonia is converted to urea and excreted from the body. Choose the sequence that correctly uses the terms urea, urine, ammonia, kidneys, liver, bloodstream.

• Ammonia is converted to urea in the liver, urea enters the bloodstream, the kidneys filter it into urine, and urine leaves the body

• Ammonia is filtered by the kidneys into urine, the liver converts urine to urea, and urea circulates in the bloodstream

• Urea is produced by the kidneys from urine, sent to the liver, and exhaled from the lungs

• Ammonia enters the bloodstream from the kidneys, the liver excretes it directly as urine, and it is reabsorbed

Circle the structures from the list below that are a part of the urinary system. Select all that apply.

• Kidneys

• Lungs

• Urinary bladder

• Stomach

• Spleen

Circle the structures from the list below that are a part of the urinary system. Select all that apply.

• Ureters

• Urethra

• Testes

• Uterus