Quena.id – Natural Sciences (IPA) is an important subject for 8th grade junior high school students.
In the grade 8 science book semester 2, there is chapter 9 which discusses the human excretory system.
In Natural Sciences, the human excretory system is an organ system that functions to remove waste products from the body’s metabolism that are not needed or are harmful to the body.
Also Read: Class 8 Science Answer Key Page 99: Choose the Most Correct Answer!
The human excretory system consists of several parts, namely the kidneys, skin, lungs and liver.
On page 80 of the grade 8 science book, there is an Let’s Discuss question which contains questions to test students’ knowledge of the material on the human excretory system.
The Let’s Discuss Questions aim to train students to think critically, analytically, and creatively in solving problems. Here is the answer key for class 8 science on page 80:
1. Does our body excrete waste? Try to identify the residual substances released by your body!
Answer: Yes, our body excretes waste by using various types of organs in the human body so that the form of the excreted substance can vary from gas to liquid.
Some examples of residual substances excreted by our bodies are:
-Carbon dioxide (CO2): is the result of the process of cellular respiration in which oxygen is used to burn food substances into energy.
Carbon dioxide is expelled by the lungs through the respiratory tract into the outside air.
– Urea: is the result of excessive protein breakdown in the body.
Urea is excreted by the kidneys through the urinary tract into the urine.
2023-08-01 05:00:00
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