3 06 Understand the functions of the Integumentary

3. 06 Understand the functions of the Integumentary System

Essential Questions: ● What are the functions of the integumentary system? ● How do you relate the integumentary system to the body’s communication systems? 3. 06: Understand the functions and disorders of the integumentary system 2

Functions of the Integumentary System ● What are the functions of the skin? 1 2 3 Absorption: the skin is able to soak up topical medications Excretion: the skin is able to produce sweat to help cool the body down and oils to help moisturize and protect the skin Production of vitamin D: UV rays help the skin to manufacture vitamin D 3

Functions of the Integumentary System ● What are the functions of the skin? Protection: The skin keeps bacteria, helps to stop dehydration, and prevents injury 4 5 Temperature Regulation: The skin helps by controlling the amount of heat loss 3. 06: Understand the functions and disorders of the integumentary system 4

Functions of the Integumentary System ● What are the functions of the skin? 6 7 Sensory Perception: Skin is the site of many nerve endings, pain, pressure, hot cold, sweat and oil Storage: Skin is a temporary storage place for glucose, water and nutrients 3. 06: Understand the functions and disorders of the integumentary system 5

Functions of the Integumentary System ● What structures are involved in these functions? ● Follow the notes on next slides ● Epidermis ● Dermis ● Appendages ● Glands 3. 06: Understand the functions and disorders of the integumentary system 6

Functions of the Integumentary System ● Epidermis ● ● Protective outer layer It has a waterproof covering that keeps skin from drying out. 3. 06: Understand the functions and disorders of the integumentary system 7

Functions of the Integumentary System ● Epidermis ● What do melanocytes do? ● Melanocytes - produce melanin, which protects skin from UV rays 3. 06: Understand the functions and disorders of the integumentary system 8

Functions of the Integumentary System ● Epidermis ● What is a major function of intact skin? ● Intact skin fights off infections - no way to get into the body 3. 06: Understand the functions and disorders of the integumentary system 9

Functions of the Integumentary System ● Epidermis ● The epidermis is composed of dead and living cells. What in their relevance to health? ● Skin has new and old cells, old cells flake off, new rise up replacing old or damaged cells 3. 06: Understand the functions and disorders of the integumentary system 10

Functions of the Integumentary System ● Epidermis ● Why are some people dark and others fair? ● Can that be changed? 3. 06: Understand the functions and disorders of the integumentary system 11

Functions of the Integumentary System ● Dermis ● Is the true layer of skin ● It is vascular ● Brings heat to the surface for cooling 12

Functions of the Integumentary System ● Dermis: Contains: ● ● ● ● ● Connective tissue Collagen tissue bands Elastic fibers Numerous blood vessels Nerve endings Muscles Hair follicles Oil glands Sweat glands Fat cells 13

Functions of the Integumentary System ● Subcutaneous layer ● Hypodermal layer Hypo- -dermal 3. 06: Understand the functions and disorders of the integumentary system 14

Functions of the Integumentary System ● Subcutaneous layer ● What are the benefits of the subcutaneous layer of skin? ● ● Under dermis Consists of fat cells Contains 50% of body’s fat stores Protects the internal body from injury 15

Functions of the Integumentary System ● Hair ● What is the function of hair? ● It helps keep the body warm ● All skin has hair except palms and soles of feet 3. 06: Understand the functions and disorders of the integumentary system 16

Functions of the Integumentary System ● Hair ● What factors influence hair type and color? ● Genetics from both parents determine hair color and hair type. 3. 06: Understand the functions and disorders of the integumentary system 17

Functions of the Integumentary System ● Hair ● What happens to your hair when you are cold? Why? ● Goosebumps: ● ● Occur when arrector pili muscle is attached to each hair contracts when body is trying to keep warm Can also occur when frightened 18

Functions of the Integumentary System ● Nails ● The nail bed underneath the nail is called the matrix ● Lunula: half moon at base of nail 3. 06: Understand the functions and disorders of the integumentary system 19

Functions of the Integumentary System ● Nails: What does the condition of a person’s nails tell about their general health? ● White nails - liver disease ● Half pink/half white - kidney disease ● Nail bed red - heart condition ● Yellow and thickening nails - lung disease ● Pale nail bed - anemia ● Yellowish with a slight blush at the tip diabetes ● Bluish in color - hypoxia 20

Functions of the Integumentary System ● Glands: Sudoriferous glands (Sweat Glands) ● Excrete certain wastes dissolved in perspiration ● Function is to cool body ● Excreted sweat is 99% water with only small quantity of salt ● Why does sweat smell bad? ● Bacteria on skin cause odors 21

Functions of the Integumentary System ● Glands: Sebaceous glands: Pimple ● Protect skin by secreting oily substance known as sebum ● Sebum lubricates skin and keeps it soft and pliable ● What causes pimples? ● Skin pores become blocked with sebum 22

Functions of the Integumentary System review ● What are the 7 functions of the skin? ● What structures are involved in these functions? 1 2 3 4 5 3. 06: Understand the functions and disorders of the integumentary system 6 7 23

Essential Questions: ● What are the functions of the integumentary system? ● How do you relate the integumentary system to the body’s communication systems? 3. 06: Understand the functions and disorders of the integumentary system 24