The document discusses the excretory organs and processes in humans. The lungs, skin, and kidneys remove waste from the body. The lungs exhale carbon dioxide and water, while the skin removes sodium chloride and urea. The kidneys filter excess water, minerals, urea, and other nitrogenous wastes from the blood to produce urine, which is stored in the urinary bladder. Plants also excrete waste through their stomata at night, releasing carbon dioxide and water through respiration even when not photosynthesizing.

2. CHAPTER 3 FORM 3 EXCRETION IN
HUMAN
By timothy yong

3. THE EXCRETORY ORGANS OF HUMANS

4. •Excretion is a proses in which remove waste
and unwanted substances from their body.
•Lung
Remove carbon dioxide and water from the
body during exhalation.

5. SKIN

6. •Skin can dissolved sodium chloride and urea .
•Kidney
Are include excess water, mineral salts urea and
other nitrogen wasted from the blood. the
urine is temporarily stored in the urinary
bladder .

8. 3.2 THE HUMAN RESPIRATORY
SYSTEM

9. THE KIDNEY

10. THE FUNCTION OF KIDNEY
•The function of kidney are to remove wastes
in the form of urine and to control the
amount of water in the body.

11. 3.3 EXCRETION IN PLANTS
•During the day, green plants carry out
photosynthesis in the presence of light. They
produce more oxygen than they need for
respiration.
•At the night green plants do not carry
photosynthesis .however ,they still respire by
taking in oxygen and giving off carbon dioxide
and water as excretory product through their
stomata