The document discusses three of the five senses: smell, taste, and touch. It explains that smell is sensed through the nose and olfactory nerve, which detects thousands of odors. Taste is sensed on the tongue through taste buds that identify the four basic tastes: bitter, sour, salty, and sweet. Touch is sensed through the skin, which can feel textures, temperatures, and pressures that sensory nerves relay to the brain. The skin also acts as a protective wrapper for the body.

1. UNIT 1:
The Human
Body
PART II: Smell, taste and
Touch

2. SIGHT HEARING SMELL
TOUCHTASTE

3. SMELL

4. We smell with our nose
Our nose
is the organ
we use to
smell

5. We can smell
about 10.000
different
odours

6. How do we smell?
Air enters
the nose
through the
nostrils
Nostrils
1
Nostrils

7. 2 The olfactory nerve sends information to our
brain which tells us what we can smell

10. Nostrils

11. Nostrils
Olfactory nerve

12. Nostrils
Brain
Olfactory nerve

13. TASTE

14. Our tongue
is the
organ we
use to
taste

15. Nerves send
information
about the
different tastes
to the brain

16. Our tongue is covered in taste buds.
These identify different tastes.

17. We can identify 4 tastes:

18. We can identify 4 tastes:

19. Bitter

20. We can identify 4 tastes:

21. Sour

22. We can identify 4 tastes:

23. Salty

24. We can identify 4 tastes:

25. Sweet

26. Which one is salty?

27. Salty

28. Which one is sour?

29. Sour

30. Which one is bitter?

31. Bitter

32. Which one is sweet?

33. Sweet

34. TOUCH

35. Our skin
is the organ
we use to
touch

37. Skin tells us if the object feels:
Soft or
Hard
Hot or
Cold
Rough or
Smooth

38. Hot Cold

39. Hard Soft

40. Smooth Rough

41. Sensory nerves
send this
information to
the brain

42. Our skin
is like a
wrapper. It
keeps out
harmful germs
and dirt.
Wrapper

44. But we not only feel with the hands…

45. Differences in hair and skin colour
are normal and make each of us
unique.