1. So what is it ? Skin and accessory structures arising from it (i.e. hair, glands & nails) Into the Integumentary system!!! BIOL 2010 Human Anatomy & Physiology I

2. What are the functions of the Integ. System?

3. Protection: “Keeps the outside out and the inside in” Barrier formed by: Layers (___________________) Chemical barrier (_______________) Cell connections (_________________________ see pg. ) When barrier penetrated then ________________ in dermis and hypodermis

4. Temperature regulation: ______________ in the dermis and hypodermis _______ or ________ to regulate blood flow in skin. Heat lost via ___________, ___________, ___________ & ___________ OK, so you have more blood circulating through your skin… So what?!? What are the functions of the Integ. System?

5. You may have noticed that, on very cold winter days, people’s ears and noses turn red. Can you explain why this happens? Take 5!!! Discuss with your neighbor and predict an answer.

6. Vitamin D production: Your body depends on _________ (UVB) to transform a precursor of vitamin D… 7-dehydrocholesterol into ________________ The intermediate (cholecalciferol) is converted to active vitamin D (______________) by liver and kidneys. Vitamin D helps regulate _______ levels. So how does this relate to skin color? What are the functions of the Integ. System?

7. Sensation: Sensory receptors in dermis and hypodermis allow us to sense… __________& _________ ________ We’ll discuss these in detail in chpt. 15 What are the functions of the Integ. System?

8. Excretion: Small amounts of ____________ ______ products (NH 3, Urea etc.) are lost through sweating. What are the functions of the Integ. System?