1. The cells in the outer layer of the skin are reinforced with a tough, impermeable protein. What is the name of this protein? keratin globin cellulose elastase

2. The skin has pores. What is the main function of these pores? release of sweat absorption of water breathing removal of excess salt

3. There are individual differences between people's skin colour, mainly due to different amounts of the pigment melanin. What is the function of melanin? to reflect heat to absorb harmful UV radiation to protect from infection to conserve water

4. When someone gets hot, their skin (unless darkly pigmented) can often be seen to get pinker. What causes this? contraction of superficial arteroles movement of capillaries nearer to the skin surface dilation of superficial arterioles movement of arterioles nearer to the skin surface

5. The skin is a large organ in the body. But which of these organs is larger than the skin? none of these lungs liver thigh muscle

6. What is the name of the skin receptors that are sensitive to gentle touch? Pacinian corpuscles sensory neurones hair follicles Meissner's corpuscles

7. Which glands secrete the grease that you need to wash off when you wash your hair? mucus glands sweat glands sebaceous glands endocrine glands

8. We sweat when we are hot. What is the main way in which sweat helps to cool us down? The sweat is hot, so it takes heat out of the body as it is secreted. Sweat secretion encourages vasodilation in the skin. Sweat drips off the body, taking away the heat. Sweat takes away latent heat when it evaporates.

9. Starting from the outside (the surface of the body), what is the correct order of the layers of the epidermis of the skin? Malpighian layer, granular layer, cornified layer. cornified layer, Malpighian layer, granular layer. cornified layer, granular layer, Malpighian layer. Malpighian layer, cornified layer, granular layer,.

10. Which of these is NOT an important function of the skin? temperature regulation protection from infection sensory reception removal of excess water