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9.3 Your skin

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Slide 1: Slide
BiologieMiddelbare schoolhavoLeerjaar 3

This lesson contains 13 slides, with text slides.

Items in this lesson

Slide 1 - Slide

9.3 Your skin

Slide 2 - Slide

Planning


Learning objectives

  • You will learn how your skin protects you and helps to keep your body at the right temperature.


  • You will also learn how wounds heal and how cancer develops.




Slide 3 - Slide

Discuss with your neighbour
- What are the functions of your skin?

Slide 4 - Slide

Functions of the skin
  1. Regulate your body temperature
  2. Protection against dirt and pathogens
  3. Protection against the sun


Slide 5 - Slide

Anatomy of the skin
The epidermis: 
  • Stratum corneum (dead skin cells). 
  • Stratum basale (cell division). 


The dermis

Subcutaneous tissue

Slide 6 - Slide

Regulation of body temperature
Temperature: around 37°

Senses of heat and senses of cold measure temperature and transmit impulses to your brain.

What are impulses? 

Slide 7 - Slide

Cooling down
  • Blood vessels in your skin become wider.
  • Heat release to the environment.
  • Skin is red
  • Your sweat glands produce more sweat.


Slide 8 - Slide

Warming up
  • Blood vessels in your skin narrow.
  • Skin is pale
  • You're going to shiver.

Fat layer? Goosebumps?


Slide 9 - Slide

Wound healing
  1. Blood vessel narrows.
  2. Clotting (clumping of platelets)
  3. Platelets burst; fibrinogen is released.
  4.  Formation of fibrin threads.
  5. Blood clotting


Slide 10 - Slide

Protection against sunlight
Ultraviolet radiation (uv-radiation) 

Cells in the stratum basale make small grains of brown colouring: pigment.

Pigment: ensures that UV radiation cannot penetrate your skin as deeply.

Slide 11 - Slide

Development of cancer

Slide 12 - Slide

What?
Make: 9.3 assignments 4-8, 10-12, 15, 16
How?
In your book. You may whisper. 
Help?
Ask your neighbour first. Then raise your hand. 
Time?
15 minutes
Finished?
Check your answers in teams!! Make a list of the bold words from 9.1 and 9.2 and their meaning.
Well done!

Slide 13 - Slide

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