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9.3 Your skin
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Biologie
Middelbare school
havo
Leerjaar 3
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Slide 1 - Diapositive
9.3 Your skin
Slide 2 - Diapositive
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 - Diapositive
Discuss with your neighbour
- What are the functions of your skin?
Slide 4 - Diapositive
Functions of the skin
Regulate your body temperature
Protection against dirt and pathogens
Protection against the sun
Slide 5 - Diapositive
Anatomy of the skin
The epidermis:
Stratum corneum (dead skin cells).
Stratum basale (cell division).
The dermis
Subcutaneous tissue
Slide 6 - Diapositive
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 - Diapositive
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 - Diapositive
Warming up
Blood vessels in your skin narrow.
Skin is pale
You're going to shiver.
Fat layer? Goosebumps?
Slide 9 - Diapositive
Wound healing
Blood vessel narrows.
Clotting
(clumping of platelets)
Platelets burst;
fibrinogen
is released.
Formation of
fibrin threads.
Blood clotting
Slide 10 - Diapositive
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 - Diapositive
Development of cancer
Slide 12 - Diapositive
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 - Diapositive
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