Page 3 - Syok Praktis PBD (2023) Science TH4

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Practice Theme 2 Life Science

2 Humans

SYOK Study

2.1 Human Breathing Process 2.2 Excretion and Defecation
1. The removal of waste products from the body
1. The breathing process provides the body with is called excretion.
oxygen and gets rid of waste, namely carbon
dioxide. The breathing organ in humans is the
lungs. Name of organ: Lungs
Waste products: Carbon
2. During the breathing process, humans use the dioxide, water vapour
nose, trachea and lungs.

Name of organ: Skin
Nose
Waste product: Sweat
Trachea

Lung
Name of organ: Kidneys
Waste product: Urine
Inhale air
3. Inhaled air contains more oxygen compared
to exhaled air. 2. Defecation is the removal of faeces from the
anus. Faeces is not produced at the anus.

Nose
Large
Trachea Small intestine
intestine
Lung
Anus
Exhale air
3. Humans must carry out excretion and
4. Exhaled air contains more carbon dioxide defecation to
compared to inhaled air. • maintain their health
• control the blood concentration in the body
5. The rate of breathing is the number of chest • control body temperature
movements (up and down) in one minute.

6. The rate of breathing depends on the type of 4. Faeces and waste products that cannot be
activity that is carried out. The more intense the removed from the body will lead to kidney
activity, the higher the rate of breathing. stones and constipation.

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Practice 2.indd 6 27/09/2022 1:53 PM