SCIENCE 4TH

1. INSIDE YOUR BODY
4th GRADE
SCIENCE

2. PARTS OF THE BODY

3. Anus
Nutrition is the combination of processes which supply our body
with the building materials and energy we need to live.

4. THE DIGESTIVE PROCESS
The digestive system helps us to get
nutrients.
Digestion is the process that enables us to
obtain nutrients from food we eat.
The digestion starts in the mouth.

5. 1. We chew food in our
mouth and mix it with
saliva.
2. This mixture goes down
the oesophagus to the
stomach.
3. In the stomach, it mixes
with gastric juices.
4. The mixture passes into
the small intestine as a thick
liquid.
5, Any undigested food
and waste continue on the
large intestine, where
water is absorbed and
faeces are formed.
6. Finally, faeces are excreted
through the anus.

6. DIGESTIVESYSTEMPROCESS:https://www.youtube.com/watch?v=VwrsL-lCZYo

7. THE RESPIRATORY SYSTEM
The respiratory system helps us breathe.
LUNGS
TRACHEA
DIAPHRAGM

8. Air enters through the nose, mouth, trachea and
bronchi.

9. Oxygen passes through the alveoli to the lungs.

10. Then, we breathe out carbon dioxide.
The diaphragm is a muscle below the lungs that moves when we
breathe.

11. BLOOD CIRCULATION
Adult’s body has about four to six litres of
blood.
There are three types of blood vessels:
- ARTERIES and VEINS are thick.
- Capillaries connect veins and arteries.
They are thin and fragile.
ARTERIES carry
blood away
from the heart
to other organs.
VEINS carry
blood back to
the heart

12. Blood: a red liquid which transports substances throughout the
body.
Blood vessels: arteries, veins and capillaries.
The heart is connected to the blood vessels and pumps blood
through them to all parts of the body.

13. The circulatory system transports blood
through the heart and around the body
in the arteries and veins.
ARTERIES
VEINS
HEART

14. EXCRETORY SYSTEM
The excretory system eliminates waste from our body.

15. 5 SENSES

16. We have 5 senses.
Our organs detect information and send this information to
the brain.

17. SIGHT

18. Our eyes are the organs of sight.

19. Light enters the eye and makes an image on the retina.
The information goes along the optic nerve and goes to the
brain.

20. THE SENSE OF HEARING

21. Our ears are the organs of hearing.

22. When sound enters the ear, the liquid inside the cochlea
moves.
The information goes along the auditory nerve and goes
to the brain.

23. SMELL

24. Our nose is the organ
of smell.
Air enters through the
nostrils.
The information goes
along the olfactory
nerve and goes to the
brain.

25. TASTE

26. The information goes along the
nerves and goes to the brain.
Our tongue is the organ of taste.
The taste buds of our tongue identify the different tastes.

27. TOUCH

28. Our skin is the organ of touch.
The information goes along the sensory nerves and goes to the
brain.

29. SKELETON
The skeleton supports our body.
The skeleton protects our organs.
Our bones are connected at joints: elbows,
knees, shoulders, wrists and ankles.

32. MUSCLES
Muscles help us move, give our body shape and protect our
organs.

35. MALE REPRODUCTIVE SYSTEM
The testicles, inside the scrotum,
produce sperm.
The sperm travels along the urethra to
the outside of the body.
URETHRA
PENIS
TESTICLES
SCROTUM

36. FEMALE REPRODUCTIVE SYSTEM
The ovaries produce ova.
Reproduction starts with fertilisation:
when the sperm joins an ovum.

37. TEACHER LETICIA