4.3 Excretion in humans

• Bio
• Secondary Education
• Age 13

Lesson 4.3

Excretion in humans

13-09-2022

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• I can explain what excretion is.
• I can describe the structure of  the excretory (renal) system.
• I can explain the function of the kidneys is to filter the blood and remove urea.
• I can state that urea is excreted in urine.

GOALS

• For support (helps plant to stand upright)
• For transport (helps carry dissolved minerals in water from the roots)
• For cooling (helps keep the plant cool in very hot places)
• For photosynthesis (helps in producing glucose and oxygen)

Uses of Water

Lesson 4.3

Excretion in humans

13-09-2022

What will happen to our body if we do not drink enough water?

Question Goal

If I do not drink enough water, then I will __________ because _____________.

My Hypothesis

If I do not drink enough water, then I will __________ because _____________.

Which of the following means getting rid of waste materials from our body?

1. nutrition
2. reproduction
3. metabolism
4. excretion

• includes ALL the waste substances that organisms make in their cells, plus any substances that is too much which have been part of the body

Excretion

• carbon dioxide from respiration
• urea , a waste substance that is made in liver cells
• excess water that's not needed by the body

Waste substances

• Any proteins in the food that we eat are broken down into smaller molecules inside the digestive system.
• These smaller molecules go into the blood and to the liver. 

Where does urea come from?

• EXCESS proteins become UREA in the liver.

Where does urea come from?

Urea is a poisonous substance.

1. TRUE
2. FALSE

Lesson 4.3

Excretion in humans

13-09-2022

Draw the structure of the excretory (renal) system.

TASK

I conclude that my hypothesis is _________ because _______.

My Conclusion

I conclude that my hypothesis is _________ because _______.

I THINK I NEED THE MOST PRACTICE ON:
1 - I can explain what excretion is.
2 - I can describe the structure of the excretory (renal) system.
3 - I can explain the function of the kidneys is to filter the blood and remove urea.
4 - I can state that urea is excreted in urine.

1

2

3

4

I am now confident.

HOW WELL DID YOU PARTICIPATE TODAY?
1 - I need to participate more! ⚠️
2 - I have participated and I will do more next time! ☺️
3 - I did an excellent job today! 🏆

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