The Excretory System

Presented by Kesler Science

Vers. 07/2020 © Kesler Science, LLC

Essential Questions:

Reflect on the Essential Questions before you dive in…

1. If you were quizzed today, which questions would you know the answers to already?

2. Which questions would you need to learn more about to answer confidently?

1. What is the main function of the excretory system and how is it structured?
2. What are the main organs in this system?

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Excretory System

• The main function is to filter blood and remove liquid waste from the body.
• Works with the circulatory, respiratory, endocrine and integumentary systems to maintain the homeostasis (balance) of water, ions, pH, blood pressure, calcium, and red blood cells in the body

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Excretory System

Kidney

• Main function is to filter waste products out of the blood passing through them
• Blood enters through renal arteries and passes back to the circulation through the renal veins.
• Works in part with the endocrine system in the formation of red blood cells, and the circulatory system to remove waste from blood

Renal artery

Renal vein

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Excretory System

Ureters

• Muscular tubes that carry urine from the kidneys to the bladder
• 25-30 cm in length
• Inner diameter about 3mm

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Excretory System

Bladder

• Pear shaped organ that holds urine to allow for urination to be infrequent and voluntary
• Capacity – 400 to 600 mL
• Emptying the bladder takes place by contraction of smooth muscles (detrusor).

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Excretory System

Urethra

• Passage way through which urine is discharged from the bladder out of the body
• Longer in the male than female
• Average daily output of urine is 1.0 – 1.5 liters/day

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Excretory System

Type your answer here

Bladder

Ureters

Kidneys

Urethra

Drag the organ names �to label the main organs �of the excretory system.

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What is the function of the excretory system?

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Function:

Name of organ

Name of organ

Name of organ

Name of organ

Quick Action: INB

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Excretory System

A mnemonic device is a pattern of letters or ideas to help you remember something.

Look at your diagrams of the excretory system. It only has four parts. Come up with a quick mnemonic to help you remember the order of the organs beginning with the kidneys.

Think About It

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Accessory Organs

These organs are not part of the path of urine, but play a part in removal of waste.

• Liver (A) – filters blood from the digestive tract
• Lungs (B) – removes carbon dioxide (waste product)when exhaled
• Skin (C) – secretes a fluid waste called sweat or perspiration

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A

C

B

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Excretory System

Diseases/Disorders of the Excretory System

• Urinary tract infections – UTI
• Kidney stones – obstruction of the urinary tract
• Cystic kidney disorder
• Cirrhosis of the liver
• Kidney failure
• Cancers of
• Kidney, bladder, ureter, prostate

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Excretory System

Hydration

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• Water makes up half of your body weight.
• You lose water when you go to the bathroom, sweat, and breathe.
• If you don’t replace the water you lose, you become dehydrated.

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Symptoms of Dehydration

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• Little or no urine, or urine that is darker than usual
• Sleepiness or fatigue
• Extreme thirst
• Headaches
• Confusion
• Dizziness

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Excretory System

Passageway through which urine is discharged from the bladder out of the body

filter waste products out of the blood passing through them

25-30 cm in length; Inner diameter about 3mm

Pear shaped organ that holds urine to allow for urination to be infrequent and voluntary

Longer in the male than female

Works in part with the circulatory system to remove waste from blood

Capacity – 400 to 600 mL

Muscular tubes that carry urine from the kidneys to the bladder

Click on and drag each card �to its correct location.

Last Look

Excretory System

Give your best answer to...�

1. Identify the structure and main function of the excretory system?�

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• Identify the main organs in this system?

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Check for Understanding

Still have questions?

Which essential questions do you still need help to understand?

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