Lesson 1 ·Class 9 · Skin — "The Jack of All Trades" · Sort Lab
Why the Skin Is Called a Jack of All Trades
One organ, many jobs.
Sort each example by which function of the skin it shows.
Sorted 0/10
All items sorted — check each bin.
Free play — sort every item into the bin it belongs in; each correct drop tells you why. Switch to when you're ready to test yourself.
Sweating appears twice over — it cools AND it excretes. That double role is part of why the skin earns its nickname.
What this lesson covers
Challenges to clear
- Fill the Sensation bin correctly.
- Sort every example.
- Fill the Excretion & synthesis box — the two jobs nobody expects skin to have.
The task
Sort each example by which function of the skin it shows.
What this lesson covers
- Protection: Keeps germs from entering the body (An unbroken skin is the body's first line of defence.); Melanin absorbs harmful ultraviolet rays (Which is why skin darkens on exposure to strong sun.); Stops the body drying out (Keratin in the epidermis makes it waterproof both ways.)
- Temperature control: Sweating cools the body on a hot day (Evaporation removes latent heat from the surface.); Skin blood vessels widen or narrow (Controlling how much heat is lost at the surface.); Subcutaneous fat insulates against cold (A poor conductor of heat, so it slows heat loss.)
- Sensation: Detects touch, pressure and pain (Different receptors in the dermis for each sensation.); Detects heat and cold (It reports to the brain, which then triggers the correcting response.)
- Excretion & synthesis: Sweat removes water, salts and a little urea (Which makes the skin a genuine excretory organ, though a minor one.); Makes vitamin D in sunlight (The only vitamin the body can manufacture for itself.)
Hint
Sweating appears twice over — it cools AND it excretes. That double role is part of why the skin earns its nickname.